| /******************************************************************************* |
| * Copyright (c) 2009, 2016 Wind River Systems, Inc. and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Markus Schorn - initial API and implementation |
| * Sergey Prigogin (Google) |
| * Nathan Ridge |
| *******************************************************************************/ |
| package org.eclipse.cdt.internal.core.dom.parser.cpp.semantics; |
| |
| import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.LVALUE; |
| import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.ALLCVQ; |
| import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.CVTYPE; |
| import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.REF; |
| import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.TDEF; |
| import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.getCVQualifier; |
| import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.getNestedType; |
| import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.getSimplifiedType; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.eclipse.cdt.core.dom.ast.ASTTypeUtil; |
| import org.eclipse.cdt.core.dom.ast.DOMException; |
| import org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory; |
| import org.eclipse.cdt.core.dom.ast.IASTUnaryExpression; |
| import org.eclipse.cdt.core.dom.ast.IArrayType; |
| import org.eclipse.cdt.core.dom.ast.IBasicType; |
| import org.eclipse.cdt.core.dom.ast.IBinding; |
| import org.eclipse.cdt.core.dom.ast.IFunctionType; |
| import org.eclipse.cdt.core.dom.ast.IPointerType; |
| import org.eclipse.cdt.core.dom.ast.IQualifierType; |
| import org.eclipse.cdt.core.dom.ast.IType; |
| import org.eclipse.cdt.core.dom.ast.ITypedef; |
| import org.eclipse.cdt.core.dom.ast.IValue; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPBase; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPBasicType; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassTemplate; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassTemplatePartialSpecialization; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionTemplate; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionType; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPMethod; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameterPackType; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPPointerToMemberType; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPReferenceType; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateArgument; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateDefinition; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateInstance; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateNonTypeParameter; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameter; |
| import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateTemplateParameter; |
| import org.eclipse.cdt.core.parser.util.ArrayUtil; |
| import org.eclipse.cdt.internal.core.dom.parser.ITypeContainer; |
| import org.eclipse.cdt.internal.core.dom.parser.IntegralValue; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPBasicType; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPPointerToMemberType; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPPointerType; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPReferenceType; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPTemplateNonTypeArgument; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPTemplateParameterMap; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPTemplateTypeArgument; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPEvaluation; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPUnknownBinding; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPUnknownMember; |
| import org.eclipse.cdt.internal.core.dom.parser.cpp.InstantiationContext; |
| |
| /** |
| * Algorithms for deducing template arguments in various contexts. |
| */ |
| public class TemplateArgumentDeduction { |
| private static class TypeOfValueDeducedFromArraySize extends CPPBasicType { |
| public TypeOfValueDeducedFromArraySize() { |
| super(ICPPBasicType.Kind.eInt, 0); |
| } |
| } |
| |
| /** |
| * Deduce arguments for a template function from the template id and the template function |
| * parameters. |
| * 14.8.2.1 |
| */ |
| static ICPPTemplateArgument[] deduceForFunctionCall(ICPPFunctionTemplate template, |
| ICPPTemplateArgument[] tmplArgs, List<IType> fnArgs, List<ValueCategory> argIsLValue, |
| CPPTemplateParameterMap map) throws DOMException { |
| final ICPPTemplateParameter[] tmplParams = template.getTemplateParameters(); |
| |
| if (tmplArgs != null && !addExplicitArguments(template, tmplParams, tmplArgs, map)) |
| return null; |
| |
| if (!deduceFromFunctionArgs(template, fnArgs, argIsLValue, map)) |
| return null; |
| |
| return createArguments(map, tmplParams); |
| } |
| |
| /** |
| * Deduces the mapping for the template parameters from the function parameters, |
| * returns <code>false</code> if there is no mapping. |
| */ |
| static boolean deduceFromFunctionArgs(ICPPFunctionTemplate template, List<IType> fnArgs, |
| List<ValueCategory> argCats, CPPTemplateParameterMap map) { |
| try { |
| IType[] fnPars = template.getType().getParameterTypes(); |
| final int fnParCount = fnPars.length; |
| final ICPPTemplateParameter[] tmplPars = template.getTemplateParameters(); |
| TemplateArgumentDeduction deduct= |
| new TemplateArgumentDeduction(tmplPars, map, new CPPTemplateParameterMap(fnParCount), 0); |
| IType fnParPack= null; |
| argLoop: for (int j= 0; j < fnArgs.size(); j++) { |
| IType par; |
| if (fnParPack != null) { |
| par= fnParPack; |
| deduct.incPackOffset(); |
| } else if (j < fnParCount) { |
| par= fnPars[j]; |
| if (par instanceof ICPPParameterPackType) { |
| if (j != fnParCount - 1) |
| continue argLoop; // Non-deduced context |
| |
| par= fnParPack= ((ICPPParameterPackType) par).getType(); |
| deduct= new TemplateArgumentDeduction(deduct, fnArgs.size() - j); |
| } |
| } else { |
| break; |
| } |
| |
| par= CPPTemplates.instantiateType(par, new InstantiationContext(map)); |
| if (!SemanticUtil.isValidType(par)) |
| return false; |
| |
| if (CPPTemplates.isDependentType(par)) { |
| IType arg = fnArgs.get(j); |
| par= SemanticUtil.getNestedType(par, SemanticUtil.TDEF); // adjustParameterType preserves typedefs |
| |
| // C++11: 14.9.2.1-1 |
| if (arg instanceof InitializerListType) { |
| par= SemanticUtil.getNestedType(par, TDEF | REF | CVTYPE); |
| |
| // Check if this is a deduced context. |
| IType inner= Conversions.getInitListType(par); |
| if (inner != null) { |
| final EvalInitList eval = ((InitializerListType) arg).getEvaluation(); |
| for (ICPPEvaluation clause : eval.getClauses()) { |
| if (!deduceFromFunctionArg(inner, clause.getType(), |
| clause.getValueCategory(), deduct)) |
| return false; |
| } |
| } |
| } else if (arg instanceof FunctionSetType) { |
| // 14.8.2.1-6 Handling of overloaded function sets |
| ICPPFunction[] fs= ((FunctionSetType) arg).getFunctionSet().getBindings(); |
| for (ICPPFunction f : fs) { |
| if (f instanceof ICPPFunctionTemplate) |
| continue argLoop; // Non-deduced context |
| } |
| |
| // Do trial deduction |
| CPPTemplateParameterMap success= null; |
| Set<String> handled= new HashSet<>(); |
| for (ICPPFunction f : fs) { |
| arg= f.getType(); |
| if (f instanceof ICPPMethod && !f.isStatic()) { |
| arg= new CPPPointerToMemberType(arg, ((ICPPMethod) f).getClassOwner(), false, false, false); |
| } |
| if (handled.add(ASTTypeUtil.getType(arg, true))) { |
| final CPPTemplateParameterMap state = deduct.saveState(); |
| if (deduceFromFunctionArg(par, arg, argCats.get(j), deduct)) { |
| if (success != null) { |
| deduct.restoreState(state); |
| continue argLoop; // Non-deduced context |
| } |
| success= deduct.saveState(); |
| } |
| deduct.restoreState(state); |
| } |
| } |
| if (success == null) |
| return false; |
| deduct.restoreState(success); |
| } else { |
| if (!deduceFromFunctionArg(par, arg, argCats.get(j), deduct)) |
| return false; |
| } |
| } |
| } |
| |
| if (!map.addDeducedArgs(deduct.fDeducedArgs)) |
| return false; |
| |
| // 14.8.2.5 - 17 |
| for (ICPPTemplateParameter tpar : tmplPars) { |
| if (tpar instanceof ICPPTemplateNonTypeParameter) { |
| ICPPTemplateArgument arg = deduct.fDeducedArgs.getArgument(tpar); |
| if (arg != null) { |
| IType type1 = ((ICPPTemplateNonTypeParameter) tpar).getType(); |
| type1= CPPTemplates.instantiateType(type1, new InstantiationContext(map)); |
| IType type2= arg.getTypeOfNonTypeValue(); |
| // Template-argument deduced from an array bound may be of any integral type. |
| if (type2 instanceof TypeOfValueDeducedFromArraySize && isIntegralType(type1)) { |
| IValue value = isBooleanType(type1) ? IntegralValue.create(true) : arg.getNonTypeValue(); |
| arg = new CPPTemplateNonTypeArgument(value, type1); |
| deduct.fDeducedArgs.put(tpar, arg); |
| } else if (!type1.isSameType(type2)) { |
| return false; |
| } |
| } |
| } |
| } |
| |
| return verifyDeduction(tmplPars, map, true); |
| } catch (DOMException e) { |
| } |
| return false; |
| } |
| |
| // 3.9.1 - 7 |
| private static boolean isIntegralType(IType type) { |
| type = SemanticUtil.getNestedType(type, SemanticUtil.TDEF); |
| if (!(type instanceof IBasicType)) |
| return false; |
| switch (((IBasicType) type).getKind()) { |
| case eInt: |
| case eInt128: |
| case eBoolean: |
| case eChar: |
| case eChar16: |
| case eChar32: |
| case eWChar: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| private static boolean isBooleanType(IType type) { |
| type = SemanticUtil.getNestedType(type, SemanticUtil.TDEF); |
| return type instanceof IBasicType && ((IBasicType) type).getKind() == IBasicType.Kind.eBoolean; |
| } |
| |
| private static boolean deduceFromFunctionArg(IType par, IType arg, ValueCategory valueCat, |
| TemplateArgumentDeduction deduct) throws DOMException { |
| boolean isReferenceTypeParameter= false; |
| if (par instanceof ICPPReferenceType) { |
| // Cannot deduce a reference type from a void type. |
| if (SemanticUtil.isVoidType(arg)) { |
| return false; |
| } |
| // If P is an rvalue reference to a cv-unqualified template parameter and the argument |
| // is an lvalue, the type "lvalue reference to A" is used in place of A for type |
| // deduction. |
| isReferenceTypeParameter= true; |
| final ICPPReferenceType refPar = (ICPPReferenceType) par; |
| if (refPar.isRValueReference() && refPar.getType() instanceof ICPPTemplateParameter && |
| valueCat == LVALUE) { |
| arg= new CPPReferenceType(getSimplifiedType(arg), false); |
| } else { |
| arg= getArgumentTypeForDeduction(arg, true); |
| } |
| par= SemanticUtil.getNestedType(par, REF | TDEF); |
| } else { |
| arg= getArgumentTypeForDeduction(arg, false); |
| } |
| |
| // 14.8.2.1-3 |
| CVQualifier cvPar= SemanticUtil.getCVQualifier(par); |
| CVQualifier cvArg= SemanticUtil.getCVQualifier(arg); |
| if (cvPar == cvArg || (isReferenceTypeParameter && cvPar.isAtLeastAsQualifiedAs(cvArg))) { |
| IType pcheck= SemanticUtil.getNestedType(par, CVTYPE); |
| if (!(pcheck instanceof ICPPTemplateParameter)) { |
| par= pcheck; |
| arg= SemanticUtil.getNestedType(arg, CVTYPE); |
| IType argcheck= arg; |
| if (par instanceof IPointerType && arg instanceof IPointerType) { |
| pcheck= ((IPointerType) par).getType(); |
| argcheck= ((IPointerType) arg).getType(); |
| if (pcheck instanceof ICPPTemplateParameter) { |
| pcheck= null; |
| } else { |
| cvPar= SemanticUtil.getCVQualifier(pcheck); |
| cvArg= SemanticUtil.getCVQualifier(argcheck); |
| if (cvPar.isAtLeastAsQualifiedAs(cvArg)) { |
| pcheck= SemanticUtil.getNestedType(pcheck, CVTYPE); |
| argcheck= SemanticUtil.getNestedType(argcheck, CVTYPE); |
| } else { |
| pcheck= null; |
| } |
| } |
| } |
| while (pcheck instanceof ITypedef) |
| pcheck = ((ITypedef) pcheck).getType(); |
| |
| if (pcheck instanceof ICPPTemplateInstance && argcheck instanceof ICPPClassType) { |
| ICPPTemplateInstance pInst = (ICPPTemplateInstance) pcheck; |
| ICPPClassTemplate pTemplate= getPrimaryTemplate(pInst); |
| if (pTemplate != null) { |
| ICPPClassType[] aInstances = findBaseInstances((ICPPClassType) argcheck, pTemplate); |
| boolean attempted = false; |
| for (ICPPClassType aInst : aInstances) { |
| if (aInst != null && aInst != argcheck) { |
| par= pcheck; |
| arg= aInst; |
| attempted = true; |
| if (deduct.fromType(par, arg, true, false)) { |
| return true; |
| } |
| } |
| } |
| if (attempted) { |
| return false; |
| } |
| } |
| } |
| } |
| } |
| |
| return deduct.fromType(par, arg, true, false); |
| } |
| |
| /** |
| * 14.8.2.2 [temp.deduct.funcaddr] |
| * Deducing template arguments taking the address of a function template |
| * @param point |
| * @throws DOMException |
| */ |
| static ICPPTemplateArgument[] deduceForAddressOf(ICPPFunctionTemplate template, |
| ICPPTemplateArgument[] tmplArgs, IFunctionType arg, CPPTemplateParameterMap map) |
| throws DOMException { |
| final ICPPTemplateParameter[] tmplParams = template.getTemplateParameters(); |
| if (!addExplicitArguments(template, tmplParams, tmplArgs, map)) |
| return null; |
| |
| IType par= template.getType(); |
| InstantiationContext context = new InstantiationContext(map); |
| par= CPPTemplates.instantiateType(par, context); |
| if (!SemanticUtil.isValidType(par)) |
| return null; |
| |
| boolean isDependentPar= CPPTemplates.isDependentType(par); |
| if (isDependentPar) { |
| TemplateArgumentDeduction deduct= |
| new TemplateArgumentDeduction(tmplParams, map, new CPPTemplateParameterMap(tmplParams.length), 0); |
| par= SemanticUtil.getNestedType(par, SemanticUtil.TDEF); |
| if (arg != null && !deduct.fromType(par, arg, false, false)) |
| return null; |
| if (!map.addDeducedArgs(deduct.fDeducedArgs)) |
| return null; |
| } |
| |
| if (!verifyDeduction(tmplParams, map, true)) |
| return null; |
| |
| if (isDependentPar) |
| par= CPPTemplates.instantiateType(par, context); |
| |
| if (arg == null || arg.isSameType(par)) { |
| return createArguments(map, tmplParams); |
| } |
| return null; |
| } |
| |
| /** |
| * Deduce arguments for a user defined conversion template |
| * 14.8.2.3 |
| */ |
| static ICPPTemplateArgument[] deduceForConversion(ICPPFunctionTemplate template, IType conversionType, |
| CPPTemplateParameterMap map) throws DOMException { |
| final ICPPTemplateParameter[] tmplParams = template.getTemplateParameters(); |
| final int length = tmplParams.length; |
| |
| ICPPTemplateArgument[] result = new ICPPTemplateArgument[length]; |
| IType a= SemanticUtil.getSimplifiedType(conversionType); |
| IType p= template.getType().getReturnType(); |
| p= getArgumentTypeForDeduction(p, a instanceof ICPPReferenceType); |
| a= SemanticUtil.getNestedType(a, SemanticUtil.REF | SemanticUtil.TDEF); |
| TemplateArgumentDeduction deduct= new TemplateArgumentDeduction(tmplParams, null, map, 0); |
| if (!deduct.fromType(p, a, true, false)) { |
| return null; |
| } |
| |
| InstantiationContext context = new InstantiationContext(map); |
| for (int i = 0; i < length; i++) { |
| if (result[i] == null) { |
| final ICPPTemplateParameter tpar = tmplParams[i]; |
| ICPPTemplateArgument deducedArg= map.getArgument(tpar); |
| if (deducedArg == null) { |
| deducedArg= CPPTemplates.instantiateArgument(tpar.getDefaultValue(), context); |
| if (!CPPTemplates.isValidArgument(deducedArg)) |
| return null; |
| } |
| result[i]= deducedArg; |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Deduce arguments for a function declaration |
| * 14.8.2.6 |
| */ |
| static ICPPTemplateArgument[] deduceForDeclaration(ICPPFunctionTemplate template, |
| ICPPTemplateArgument[] args, ICPPFunctionType ftype, CPPTemplateParameterMap map) |
| throws DOMException { |
| final ICPPTemplateParameter[] tmplParams = template.getTemplateParameters(); |
| |
| if (!addExplicitArguments(template, tmplParams, args, map)) |
| return null; |
| |
| IType a= SemanticUtil.getSimplifiedType(ftype); |
| InstantiationContext context = new InstantiationContext(map); |
| IType p= CPPTemplates.instantiateType(template.getType(), context); |
| if (!SemanticUtil.isValidType(p)) |
| return null; |
| |
| TemplateArgumentDeduction deduct= |
| new TemplateArgumentDeduction(tmplParams, map, new CPPTemplateParameterMap(tmplParams.length), 0); |
| if (!deduct.fromType(p, a, false, false)) { |
| return null; |
| } |
| |
| if (!map.addDeducedArgs(deduct.fDeducedArgs)) |
| return null; |
| |
| if (!verifyDeduction(tmplParams, map, true)) |
| return null; |
| |
| IType type= CPPTemplates.instantiateType(p, context); |
| if (!ftype.isSameType(type)) |
| return null; |
| |
| return createArguments(map, tmplParams); |
| } |
| |
| /** |
| * Deduces the mapping for the template parameters from the function parameters, |
| * returns <code>false</code> if there is no mapping. |
| */ |
| static int deduceForPartialOrdering(ICPPTemplateParameter[] tmplPars, IType[] fnPars, IType[] fnArgs) { |
| try { |
| final int fnParCount = fnPars.length; |
| final int fnArgCount = fnArgs.length; |
| int result= 0; |
| TemplateArgumentDeduction deduct= |
| new TemplateArgumentDeduction(tmplPars, new CPPTemplateParameterMap(0), new CPPTemplateParameterMap(fnParCount), 0); |
| IType fnParPack= null; |
| Set<Integer> usedTemplateParIds= new HashSet<>(); |
| for (int j= 0; j < fnArgCount; j++) { |
| IType par; |
| if (fnParPack != null) { |
| par= fnParPack; |
| deduct.incPackOffset(); |
| } else { |
| if (j >= fnParCount) |
| return -1; |
| |
| par= fnPars[j]; |
| if (par instanceof ICPPParameterPackType) { |
| if (j != fnParCount - 1) |
| continue; // non-deduced context |
| |
| par= fnParPack= ((ICPPParameterPackType) par).getType(); |
| deduct= new TemplateArgumentDeduction(deduct, fnArgs.length - j); |
| } |
| } |
| |
| IType arg = fnArgs[j]; |
| addReferencedTemplateParameters(par, usedTemplateParIds); |
| int cmpSpecialized= deduceForPartialOrdering(par, arg, deduct); |
| if (cmpSpecialized < 0) |
| return cmpSpecialized; |
| if (cmpSpecialized > 0) |
| result= cmpSpecialized; |
| } |
| return verifyDeductionForPartialOrdering(tmplPars, usedTemplateParIds, deduct.fDeducedArgs) ? result : -1; |
| } catch (DOMException e) { |
| } |
| return -1; |
| } |
| |
| private static void addReferencedTemplateParameters(IType t, Set<Integer> usedTemplateParIds) { |
| while (true) { |
| if (t instanceof ICPPTemplateParameter) { |
| usedTemplateParIds.add(((ICPPTemplateParameter) t).getParameterID()); |
| return; |
| } else if (t instanceof ICPPFunctionType) { |
| final ICPPFunctionType ft = (ICPPFunctionType) t; |
| for (IType par : ft.getParameterTypes()) |
| addReferencedTemplateParameters(par, usedTemplateParIds); |
| t = ft.getReturnType(); |
| } else if (t instanceof ICPPPointerToMemberType) { |
| ICPPPointerToMemberType ptmt = (ICPPPointerToMemberType) t; |
| addReferencedTemplateParameters(ptmt.getMemberOfClass(), usedTemplateParIds); |
| t = ptmt.getType(); |
| } else if (t instanceof ICPPTemplateInstance) { |
| ICPPTemplateInstance inst = (ICPPTemplateInstance) t; |
| for (ICPPTemplateArgument arg : inst.getTemplateArguments()) { |
| if (arg instanceof CPPTemplateTypeArgument) |
| addReferencedTemplateParameters(arg.getTypeValue(), usedTemplateParIds); |
| else |
| addReferencedTemplateParameters(arg.getNonTypeValue(), usedTemplateParIds); |
| } |
| if (inst.getTemplateDefinition() instanceof IType) { |
| t = (IType) inst.getTemplateDefinition(); |
| } else { |
| return; |
| } |
| } else if (t instanceof ICPPUnknownMember) { |
| t = ((ICPPUnknownMember) t).getOwnerType(); |
| } else if (t instanceof ITypeContainer) { |
| if (t instanceof IArrayType) |
| addReferencedTemplateParameters(((IArrayType) t).getSize(), usedTemplateParIds); |
| t = ((ITypeContainer) t).getType(); |
| } else { |
| return; |
| } |
| } |
| } |
| |
| private static void addReferencedTemplateParameters(IValue v, Set<Integer> usedTemplatePars) { |
| if (v != null && v.getEvaluation() instanceof EvalBinding) { |
| IBinding binding = ((EvalBinding) v.getEvaluation()).getBinding(); |
| if (binding instanceof ICPPTemplateParameter) { |
| usedTemplatePars.add(((ICPPTemplateParameter) binding).getParameterID()); |
| } |
| } |
| } |
| |
| /** |
| * 14.8.2.4-11 [temp.deduction.partial] |
| * In most cases, all template parameters must have values in order for deduction to succeed, |
| * but for partial ordering purposes a template parameter may remain without a value provided |
| * it is not used in the types being used for partial ordering. |
| */ |
| private static boolean verifyDeductionForPartialOrdering(ICPPTemplateParameter[] pars, |
| Set<Integer> usedParIds, CPPTemplateParameterMap tpMap) { |
| for (ICPPTemplateParameter tpar : pars) { |
| if (usedParIds.contains(tpar.getParameterID())) { |
| if (tpar.isParameterPack()) { |
| ICPPTemplateArgument[] deducedArgs = tpMap.getPackExpansion(tpar); |
| if (deducedArgs != null) { |
| for (ICPPTemplateArgument arg : deducedArgs) { |
| if (arg == null) |
| return false; |
| } |
| } |
| } else { |
| if (tpMap.getArgument(tpar) == null) |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| private static int deduceForPartialOrdering(IType par, IType arg, TemplateArgumentDeduction deduct) throws DOMException { |
| par= getNestedType(par, TDEF); |
| arg= getNestedType(arg, TDEF); |
| boolean isMoreCVQualified= false; |
| if (par instanceof ICPPReferenceType && arg instanceof ICPPReferenceType) { |
| par= getNestedType(par, REF | TDEF); |
| arg= getNestedType(arg, REF | TDEF); |
| CVQualifier cvp= getCVQualifier(par); |
| CVQualifier cva= getCVQualifier(arg); |
| isMoreCVQualified= cva.isMoreQualifiedThan(cvp); |
| } |
| par= getNestedType(par, TDEF | REF | ALLCVQ); |
| arg= getNestedType(arg, TDEF | REF | ALLCVQ); |
| |
| if (!deduct.fromType(par, arg, false, false)) |
| return -1; |
| |
| return isMoreCVQualified ? 1 : 0; |
| } |
| |
| /** |
| * Adds the explicit arguments to the map. |
| */ |
| public static boolean addExplicitArguments(ICPPFunctionTemplate template, final ICPPTemplateParameter[] tmplParams, |
| ICPPTemplateArgument[] tmplArgs, CPPTemplateParameterMap map) { |
| tmplArgs= SemanticUtil.getSimplifiedArguments(tmplArgs); |
| ICPPTemplateParameter tmplParam= null; |
| int packOffset= -1; |
| for (int i = 0; i < tmplArgs.length; i++) { |
| if (packOffset < 0 || tmplParam == null) { |
| if (i >= tmplParams.length) |
| return false; |
| |
| tmplParam= tmplParams[i]; |
| if (tmplParam.isParameterPack()) { |
| packOffset= i; |
| } |
| } |
| ICPPTemplateArgument tmplArg= tmplArgs[i]; |
| tmplArg= CPPTemplates.matchTemplateParameterAndArgument(template, tmplParam, tmplArg, map); |
| if (tmplArg == null) |
| return false; |
| |
| if (packOffset < 0) { |
| map.put(tmplParam, tmplArg); |
| } |
| } |
| |
| if (packOffset >= 0) { |
| final int packSize= tmplArgs.length- packOffset; |
| ICPPTemplateArgument[] pack= new ICPPTemplateArgument[packSize]; |
| System.arraycopy(tmplArgs, packOffset, pack, 0, packSize); |
| map.put(tmplParam, pack); |
| } |
| return true; |
| } |
| |
| private static ICPPTemplateArgument[] createArguments(CPPTemplateParameterMap map, |
| final ICPPTemplateParameter[] tmplParams) { |
| List<ICPPTemplateArgument> result= new ArrayList<>(tmplParams.length); |
| for (ICPPTemplateParameter tpar : tmplParams) { |
| if (tpar.isParameterPack()) { |
| ICPPTemplateArgument[] deducedArgs= map.getPackExpansion(tpar); |
| if (deducedArgs == null) |
| return null; |
| result.addAll(Arrays.asList(deducedArgs)); |
| } else { |
| ICPPTemplateArgument deducedArg= map.getArgument(tpar); |
| if (deducedArg == null) { |
| return null; |
| } |
| |
| result.add(deducedArg); |
| } |
| } |
| return result.toArray(new ICPPTemplateArgument[result.size()]); |
| } |
| |
| /** |
| * 14.8.2.1.3 If P is a class and has the form template-id, then A can be a derived class of |
| * the deduced A. |
| */ |
| private static ICPPClassType[] findBaseInstances(ICPPClassType a, ICPPClassTemplate pTemplate) throws DOMException { |
| return findBaseInstances(a, pTemplate, CPPSemantics.MAX_INHERITANCE_DEPTH, new HashSet<>()); |
| } |
| |
| private static ICPPClassType[] findBaseInstances(ICPPClassType a, ICPPClassTemplate pTemplate, int maxdepth, |
| HashSet<Object> handled) throws DOMException { |
| if (a instanceof ICPPTemplateInstance) { |
| ICPPTemplateInstance inst = (ICPPTemplateInstance) a; |
| ICPPClassTemplate tmpl= getPrimaryTemplate(inst); |
| if (pTemplate.isSameType(tmpl)) |
| return new ICPPClassType[] { a }; |
| } |
| ICPPClassType[] results = ICPPClassType.EMPTY_CLASS_ARRAY; |
| if (maxdepth-- > 0) { |
| for (ICPPBase cppBase : a.getBases()) { |
| IBinding base= cppBase.getBaseClass(); |
| if (base instanceof ICPPClassType && handled.add(base)) { |
| ICPPClassType[] inst= findBaseInstances((ICPPClassType) base, pTemplate, maxdepth, handled); |
| results = ArrayUtil.addAll(results, inst); |
| } |
| } |
| } |
| return ArrayUtil.trim(results); |
| } |
| |
| private static ICPPClassTemplate getPrimaryTemplate(ICPPTemplateInstance inst) throws DOMException { |
| ICPPTemplateDefinition template= inst.getTemplateDefinition(); |
| if (template instanceof ICPPClassTemplatePartialSpecialization) { |
| return ((ICPPClassTemplatePartialSpecialization) template).getPrimaryClassTemplate(); |
| } else if (template instanceof ICPPClassTemplate) { |
| return (ICPPClassTemplate) template; |
| } |
| return null; |
| } |
| |
| /** |
| * 14.8.2.1-2 |
| * if P is not a reference type |
| * - If A is an array type, the pointer type produced by the array-to-pointer conversion is used instead |
| * - If A is a function type, the pointer type produced by the function-to-pointer conversion is used instead |
| * - If A is a cv-qualified type, the top level cv-qualifiers are ignored for type deduction |
| * |
| * Also 14.8.2.3-2 where the same logics is used in reverse. |
| */ |
| private static IType getArgumentTypeForDeduction(IType type, boolean parameterIsAReferenceType) { |
| type = SemanticUtil.getSimplifiedType(type); |
| if (type instanceof ICPPReferenceType) { |
| type = ((ICPPReferenceType) type).getType(); |
| } |
| IType result = type; |
| if (!parameterIsAReferenceType) { |
| if (type instanceof IArrayType) { |
| result = new CPPPointerType(((IArrayType) type).getType()); |
| } else if (type instanceof IFunctionType) { |
| result = new CPPPointerType(type); |
| } else { |
| result = SemanticUtil.getNestedType(type, TDEF | ALLCVQ); |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Deduces the template parameter mapping from pairs of template arguments. |
| */ |
| public static boolean fromTemplateArguments(final ICPPTemplateParameter[] pars, |
| final ICPPTemplateArgument[] p, final ICPPTemplateArgument[] a, CPPTemplateParameterMap map) |
| throws DOMException { |
| TemplateArgumentDeduction deduct= new TemplateArgumentDeduction(pars, null, map, 0); |
| if (p == null) { |
| return false; |
| } |
| boolean containsPackExpansion= false; |
| for (int j= 0; j < p.length; j++) { |
| if (p[j].isPackExpansion()) { |
| deduct = new TemplateArgumentDeduction(deduct, a.length - j); |
| containsPackExpansion= true; |
| if (j != p.length - 1) { |
| return false; // A pack expansion must be the last argument to the specialization. |
| } |
| ICPPTemplateArgument pattern = p[j].getExpansionPattern(); |
| for (int i= j; i < a.length; i++) { |
| if (i != j) |
| deduct.incPackOffset(); |
| if (!deduct.fromTemplateArgument(pattern, a[i])) { |
| return false; |
| } |
| } |
| break; |
| } else { |
| if (j >= a.length) { |
| return false; // Not enough arguments. |
| } |
| if (!deduct.fromTemplateArgument(p[j], a[j])) { |
| return false; |
| } |
| } |
| } |
| if (!containsPackExpansion && p.length < a.length) |
| return false; // Too many arguments. |
| return verifyDeduction(pars, map, false); |
| } |
| |
| private static boolean verifyDeduction(ICPPTemplateParameter[] pars, CPPTemplateParameterMap tpMap, |
| boolean useDefaults) { |
| InstantiationContext context = new InstantiationContext(tpMap); |
| for (ICPPTemplateParameter tpar : pars) { |
| if (tpar.isParameterPack()) { |
| ICPPTemplateArgument[] deducedArgs= tpMap.getPackExpansion(tpar); |
| if (deducedArgs == null) { |
| context.addToParameterMap(tpar, ICPPTemplateArgument.EMPTY_ARGUMENTS); |
| } else { |
| for (ICPPTemplateArgument arg : deducedArgs) { |
| if (arg == null) |
| return false; |
| } |
| } |
| } else { |
| ICPPTemplateArgument deducedArg= tpMap.getArgument(tpar); |
| if (deducedArg == null && useDefaults) { |
| deducedArg= tpar.getDefaultValue(); |
| if (deducedArg != null) { |
| deducedArg= CPPTemplates.instantiateArgument(deducedArg, context); |
| if (CPPTemplates.isValidArgument(deducedArg)) { |
| context.addToParameterMap(tpar, deducedArg); |
| } |
| } |
| } |
| if (deducedArg == null) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| |
| private final CPPTemplateParameterMap fExplicitArgs; |
| private CPPTemplateParameterMap fDeducedArgs; |
| private Set<Integer> fTemplateParameterPacks; |
| private int fPackOffset; |
| private final int fPackSize; |
| |
| private TemplateArgumentDeduction(ICPPTemplateParameter[] tpars, CPPTemplateParameterMap explicit, |
| CPPTemplateParameterMap result, int packSize) { |
| fExplicitArgs= explicit; |
| fDeducedArgs= result; |
| fPackSize= packSize; |
| fPackOffset= packSize > 0 ? 0 : -1; |
| for (ICPPTemplateParameter tpar : tpars) { |
| if (tpar.isParameterPack()) { |
| if (fTemplateParameterPacks == null) { |
| fTemplateParameterPacks= new HashSet<>(); |
| } |
| fTemplateParameterPacks.add(tpar.getParameterID()); |
| } |
| } |
| } |
| |
| private TemplateArgumentDeduction(TemplateArgumentDeduction base, int packSize) { |
| fExplicitArgs= base.fExplicitArgs; |
| fDeducedArgs= base.fDeducedArgs; |
| fTemplateParameterPacks= base.fTemplateParameterPacks; |
| fPackSize= packSize; |
| fPackOffset= packSize > 0 ? 0 : -1; |
| } |
| |
| private CPPTemplateParameterMap saveState() { |
| return new CPPTemplateParameterMap(fDeducedArgs); |
| } |
| |
| private void restoreState(CPPTemplateParameterMap saved) { |
| fDeducedArgs= saved; |
| } |
| |
| private void incPackOffset() { |
| fPackOffset++; |
| assert fPackOffset < fPackSize; |
| } |
| |
| /** |
| * Deduces the template parameter mapping from one pair of template arguments. |
| */ |
| private boolean fromTemplateArgument(ICPPTemplateArgument p, ICPPTemplateArgument a) |
| throws DOMException { |
| if (p.isNonTypeValue() != a.isNonTypeValue()) |
| return false; |
| |
| if (p.isNonTypeValue()) { |
| IValue tval= p.getNonTypeValue(); |
| |
| if (IntegralValue.referencesTemplateParameter(tval)) { |
| int parId= IntegralValue.isTemplateParameter(tval); |
| if (parId >= 0) { |
| ICPPTemplateArgument old= fDeducedArgs.getArgument(parId, fPackOffset); |
| if (old == null) { |
| return deduce(parId, a); |
| } |
| return old.isSameValue(a); |
| } else { |
| // Non-deduced context |
| return true; |
| } |
| } |
| IValue sval= a.getNonTypeValue(); |
| return tval.equals(sval); |
| } |
| |
| // Try to deduce from the original argument type, but if it fails, fall back to the simplified |
| // argument type. |
| return fromType(p.getTypeValue(), a.getOriginalTypeValue(), false, true) |
| || (a.getTypeValue() != a.getOriginalTypeValue() |
| && fromType(p.getTypeValue(), a.getTypeValue(), false, true)); |
| } |
| |
| private boolean fromType(IType p, IType a, boolean allowCVQConversion, boolean verifyNonDeduced) |
| throws DOMException { |
| IType originalArgType = a; |
| a = SemanticUtil.getSimplifiedType(a); |
| while (p != null) { |
| while (a instanceof ITypedef) |
| a = ((ITypedef) a).getType(); |
| while (p instanceof ITypedef) |
| p = ((ITypedef) p).getType(); |
| if (p instanceof IBasicType) { |
| return p.isSameType(a); |
| } else if (p instanceof ICPPPointerToMemberType) { |
| if (!(a instanceof ICPPPointerToMemberType)) |
| return false; |
| final ICPPPointerToMemberType ptrP = (ICPPPointerToMemberType) p; |
| final ICPPPointerToMemberType ptrA = (ICPPPointerToMemberType) a; |
| if (!allowCVQConversion && (ptrP.isConst() != ptrA.isConst() || ptrP.isVolatile() != ptrA.isVolatile())) |
| return false; |
| if (!fromType(ptrP.getMemberOfClass(), ptrA.getMemberOfClass(), false, false)) { |
| return false; |
| } |
| p = ptrP.getType(); |
| a = ptrA.getType(); |
| } else if (p instanceof IPointerType) { |
| final IPointerType ptrP = (IPointerType) p; |
| p = ptrP.getType(); |
| if (a instanceof TypeOfDependentExpression) { |
| ICPPEvaluation eval = ((TypeOfDependentExpression) a).getEvaluation(); |
| eval = new EvalUnary(IASTUnaryExpression.op_star, eval, null, eval.getTemplateDefinition()); |
| a = new TypeOfDependentExpression(eval); |
| } else { |
| if (!(a instanceof IPointerType)) |
| return false; |
| final IPointerType ptrA = (IPointerType) a; |
| if (!allowCVQConversion && (ptrP.isConst() != ptrA.isConst() || ptrP.isVolatile() != ptrA.isVolatile())) |
| return false; |
| a = ptrA.getType(); |
| } |
| } else if (p instanceof ICPPReferenceType) { |
| if (!(a instanceof ICPPReferenceType)) { |
| return false; |
| } |
| final ICPPReferenceType rp = (ICPPReferenceType) p; |
| final ICPPReferenceType ra = (ICPPReferenceType) a; |
| if (ra.isRValueReference() != rp.isRValueReference()) |
| return false; |
| p = rp.getType(); |
| a = ra.getType(); |
| } else if (p instanceof IArrayType) { |
| if (!(a instanceof IArrayType)) { |
| return false; |
| } |
| IArrayType aa= (IArrayType) a; |
| IArrayType pa= (IArrayType) p; |
| IValue as= aa.getSize(); |
| IValue ps= pa.getSize(); |
| if (as != ps) { |
| if (as == null || ps == null) |
| return false; |
| |
| int parID= IntegralValue.isTemplateParameter(ps); |
| if (parID >= 0) { |
| ICPPTemplateArgument old= fDeducedArgs.getArgument(parID, fPackOffset); |
| if (old == null) { |
| if (!deduce(parID, new CPPTemplateNonTypeArgument(as, new TypeOfValueDeducedFromArraySize()))) { |
| return false; |
| } |
| } else if (!as.equals(old.getNonTypeValue())) { |
| return false; |
| } |
| } else if (!as.equals(as)) { |
| return false; |
| } |
| } |
| p = pa.getType(); |
| a = aa.getType(); |
| } else if (p instanceof IQualifierType) { |
| final CVQualifier cvqP = SemanticUtil.getCVQualifier(p); |
| final CVQualifier cvqA = SemanticUtil.getCVQualifier(a); |
| CVQualifier remaining= CVQualifier.NONE; |
| if (cvqP != cvqA) { |
| if (!allowCVQConversion && !cvqA.isAtLeastAsQualifiedAs(cvqP)) |
| return false; |
| remaining= cvqA.remove(cvqP); |
| } |
| p = SemanticUtil.getNestedType(p, ALLCVQ); |
| a = SemanticUtil.getNestedType(a, ALLCVQ); |
| if (p instanceof IQualifierType) |
| return false; |
| if (remaining != CVQualifier.NONE) { |
| a= SemanticUtil.addQualifiers(a, remaining.isConst(), remaining.isVolatile(), |
| remaining.isRestrict()); |
| } |
| } else if (p instanceof ICPPFunctionType) { |
| ICPPFunctionType ftp = (ICPPFunctionType) p; |
| if (a instanceof ICPPFunctionType) |
| return fromFunctionType(ftp, (ICPPFunctionType) a); |
| |
| if (a instanceof FunctionSetType) { |
| // 14.8.2.1-6 Handling of overloaded function sets. |
| CPPTemplateParameterMap success = null; |
| ICPPFunction[] fs= ((FunctionSetType) a).getFunctionSet().getBindings(); |
| for (ICPPFunction f : fs) { |
| ICPPFunctionType fta = f.getType(); |
| final CPPTemplateParameterMap saved = saveState(); |
| try { |
| if (fromFunctionType(ftp, fta)) { |
| if (success != null) |
| return false; |
| success = saveState(); |
| } |
| } finally { |
| restoreState(saved); |
| } |
| } |
| if (success != null) { |
| restoreState(success); |
| return true; |
| } |
| } |
| return false; |
| } else if (p instanceof ICPPTemplateParameter) { |
| ICPPTemplateArgument current= |
| fDeducedArgs.getArgument(((ICPPTemplateParameter) p).getParameterID(), fPackOffset); |
| if (current != null) { |
| if (current.isNonTypeValue()) |
| return false; |
| return current.getTypeValue().isSameType(a); |
| } |
| if (a == null) |
| return false; |
| return deduce(((ICPPTemplateParameter) p).getParameterID(), |
| new CPPTemplateTypeArgument(a, ExpressionTypes.restoreTypedefs(a, originalArgType))); |
| } else if (p instanceof ICPPTemplateInstance) { |
| if (!(a instanceof ICPPTemplateInstance)) |
| return false; |
| return fromTemplateInstance((ICPPTemplateInstance) p, (ICPPTemplateInstance) a); |
| } else if (p instanceof ICPPUnknownBinding) { |
| if (!verifyNonDeduced) |
| return true; // An unknown type may match anything. |
| |
| // Verify that the resolved binding matches the argument type. |
| InstantiationContext context = new InstantiationContext(fDeducedArgs); |
| IBinding binding = CPPTemplates.resolveUnknown((ICPPUnknownBinding) p, context); |
| if (binding instanceof ICPPUnknownBinding) |
| return true; // An unknown type may match anything. |
| |
| return binding instanceof IType && ((IType) binding).isSameType(a); |
| } else { |
| return p.isSameType(a); |
| } |
| } |
| |
| return false; |
| } |
| |
| private boolean fromTemplateInstance(ICPPTemplateInstance pInst, ICPPTemplateInstance aInst) |
| throws DOMException { |
| ICPPClassTemplate pTemplate= getPrimaryTemplate(pInst); |
| ICPPClassTemplate aTemplate= getPrimaryTemplate(aInst); |
| if (pTemplate == null || aTemplate == null) |
| return false; |
| |
| if (pTemplate instanceof ICPPTemplateTemplateParameter) { |
| final int tparId = ((ICPPTemplateTemplateParameter) pTemplate).getParameterID(); |
| ICPPTemplateArgument current= fDeducedArgs.getArgument(tparId, fPackOffset); |
| if (current != null) { |
| if (current.isNonTypeValue() || !current.getTypeValue().isSameType(aTemplate)) |
| return false; |
| } else if (!deduce(tparId, new CPPTemplateTypeArgument(aTemplate))) { |
| return false; |
| } |
| } else if (!aTemplate.isSameType(pTemplate)) { |
| return false; |
| } |
| |
| // Check for being a non-deduced context. |
| final ICPPTemplateArgument[] pArgs = pInst.getTemplateArguments(); |
| for (int i = 0; i < pArgs.length - 1; i++) { |
| if (pArgs[i].isPackExpansion()) |
| return true; // non-deduced context |
| } |
| |
| final ICPPTemplateArgument[] aArgs = aInst.getTemplateArguments(); |
| if (pArgs.length != aArgs.length) { |
| if (pArgs.length == 0 || pArgs.length > aArgs.length + 1) |
| return false; |
| ICPPTemplateArgument lastPParam= pArgs[pArgs.length - 1]; |
| if (!lastPParam.isPackExpansion()) |
| return false; |
| } |
| |
| ICPPTemplateArgument expansionPattern= null; |
| TemplateArgumentDeduction deduct= this; |
| for (int i = 0; i < aArgs.length; i++) { |
| ICPPTemplateArgument p; |
| if (expansionPattern != null) { |
| p= expansionPattern; |
| deduct.incPackOffset(); |
| InstantiationContext context = |
| new InstantiationContext(fExplicitArgs, deduct.fPackOffset); |
| p= CPPTemplates.instantiateArgument(p, context); |
| if (!CPPTemplates.isValidArgument(p)) |
| return false; |
| } else { |
| p= pArgs[i]; |
| if (p.isPackExpansion()) { |
| p= expansionPattern= p.getExpansionPattern(); |
| deduct= new TemplateArgumentDeduction(this, aArgs.length - i); |
| InstantiationContext context = |
| new InstantiationContext(fExplicitArgs, deduct.fPackOffset); |
| p= CPPTemplates.instantiateArgument(p, context); |
| if (!CPPTemplates.isValidArgument(p)) |
| return false; |
| } |
| } |
| if (!deduct.fromTemplateArgument(p, aArgs[i])) |
| return false; |
| } |
| return true; |
| } |
| |
| private boolean fromFunctionType(ICPPFunctionType ftp, ICPPFunctionType fta) |
| throws DOMException { |
| if (ftp.isConst() != fta.isConst() || |
| ftp.isVolatile() != fta.isVolatile() || |
| ftp.takesVarArgs() != fta.takesVarArgs() || |
| ftp.hasRefQualifier() != fta.hasRefQualifier() || |
| ftp.isRValueReference() != fta.isRValueReference()) { |
| return false; |
| } |
| |
| if (!fromType(ftp.getReturnType(), fta.getReturnType(), false, false)) |
| return false; |
| |
| IType[] pParams = ftp.getParameterTypes(); |
| IType[] aParams = fta.getParameterTypes(); |
| if (pParams.length != aParams.length) { |
| if (SemanticUtil.isEmptyParameterList(pParams) && SemanticUtil.isEmptyParameterList(aParams)) |
| return true; |
| if (pParams.length == 0 || pParams.length > aParams.length + 1) |
| return false; |
| IType lastPParam= pParams[pParams.length - 1]; |
| if (!(lastPParam instanceof ICPPParameterPackType)) |
| return false; |
| } |
| IType parameterPack= null; |
| TemplateArgumentDeduction deduct= this; |
| for (int i = 0; i < aParams.length; i++) { |
| IType p; |
| if (parameterPack != null) { |
| p= parameterPack; |
| deduct.incPackOffset(); |
| InstantiationContext context = |
| new InstantiationContext(fExplicitArgs, deduct.fPackOffset); |
| p= CPPTemplates.instantiateType(p, context); |
| if (!SemanticUtil.isValidType(p)) |
| return false; |
| } else { |
| p= pParams[i]; |
| if (p instanceof ICPPParameterPackType) { |
| p= parameterPack= ((ICPPParameterPackType) p).getType(); |
| deduct= new TemplateArgumentDeduction(this, aParams.length - i); |
| InstantiationContext context = |
| new InstantiationContext(fExplicitArgs, deduct.fPackOffset); |
| p= CPPTemplates.instantiateType(p, context); |
| if (!SemanticUtil.isValidType(p)) |
| return false; |
| } |
| } |
| if (!deduct.fromType(p, aParams[i], false, true)) |
| return false; |
| } |
| return true; |
| } |
| |
| private boolean deduce(int parID, ICPPTemplateArgument arg) { |
| if (fTemplateParameterPacks != null && fTemplateParameterPacks.contains(parID)) { |
| if (fPackSize == 0) |
| return false; |
| return fDeducedArgs.putPackElement(parID, fPackOffset, arg, fPackSize); |
| } |
| if (SemanticUtil.isUniqueTypeForParameterPack(arg.getTypeValue())) |
| return false; |
| fDeducedArgs.put(parID, arg); |
| return true; |
| } |
| } |
