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| <h1>Adding watchpoints</h1> |
| |
| <p>A watchpoint is a special breakpoint that stops the execution of an |
| application whenever the value of a given expression changes, without specifying |
| where this may happen. Unlike breakpoints which are line-specific watchpoints |
| are associated with files. They take effect whenever a specified condition is |
| true regardless of when or where it occurred.</p> |
| |
| <p>To add a watchpoint:</p> |
| |
| <ol> |
| <li>Click <b>Run > Add C/C++ Watchpoint</b>.</li> |
| <ol> |
| <li>If <b>Add C/C++ Watchpoint</b> is not listed on the Run menu, select <b>Window |
| > Customize Perspective</b>.</li><li>In the Customize Perspective dialog |
| box, expand <b>Other</b> in the <b>Available Items</b> list.</li><li>Select the <b>C/C++ Debug</b> check box. Click <b>OK</b>.</li> |
| </ol> |
| <li>In the <b>Add C/C++ Watchpoint</b> dialog box, type an expression in the <b>Expression to watch</b> |
| box. The |
| expression may be anything that can be evaluated inside an <samp>if</samp> |
| statement.</li> |
| <li>Do any of the following:</li> |
| <ul><li>To stop execution when the watch expression is read, select the |
| <b>Read</b> check box.</li> |
| <li>To stop execution when the watch expression is written to, select the <b>Write</b> |
| check box.</li></ul> |
| <li>In the C/C++ editor, open the file that you added the watchpoint to.</li> |
| <li>Click <b>OK</b>.</li> |
| <li>The watchpoint appears in the <b>Breakpoints</b> view |
| list.</li> |
| </ol> |
| |
| <p><img border="0" src="../images/ngconcepts.gif" ALT="Related concepts" width="143" height="21"> |
| <br> |
| <a href="../concepts/cdt_c_over_cdt.htm">C/C++ Development perspective</a><br> |
| <a href="../concepts/cdt_o_projects.htm">Projects</a></p> |
| <p><img border="0" src="../images/ngtasks.gif" ALT="Related tasks" width="143" height="21"> |
| <br> |
| <a href="cdt_o_brkpnts_watch.htm">Working with breakpoints and watchpoints</a></p> |
| <p><img border="0" src="../images/ngref.gif" ALT="Related reference" width="143" height="21"> |
| <br> |
| <a href="../reference/cdt_o_run_dbg_pages.htm">Run and Debug dialog box</a></p> |
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