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| <div role="main"><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 it might occur. 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. You can set a watchpoint on a global variable by highlighting the variable in the editor, or by selecting it in the Outline view. </p> |
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| <p>To set a watchpoint on a global variable:</p> |
| |
| <ol> |
| <li>Highlight the variable in the editor, or select it in the Outline view.</li> |
| <li>Click <strong>Run > Toggle Watchpoint</strong>.</li> |
| <li>Do any of the following: |
| <ul><li>To stop execution when the watch expression is read, select the |
| <strong>Read</strong> check box.</li> |
| <li>To stop execution when the watch expression is written to, select the <strong>Write</strong> |
| check box.</li></ul> |
| </li> |
| <li>The watchpoint appears in the <strong>Breakpoints</strong> view |
| list.</li> |
| </ol> |
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| <p><img src="../images/ngconcepts.gif" ALT="Related concepts" width="143" height="21"> |
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| <a href="../concepts/cdt_c_over_cdt.htm">C/C++ Development perspective</a></p> |
| <p><img src="../images/ngtasks.gif" ALT="Related tasks" width="143" height="21"> |
| <br> |
| <a href="cdt_o_brkpnts_watch.htm">Using breakpoints and watchpoints</a></p> |
| <p><img src="../images/ngref.gif" ALT="Related reference" width="143" height="21"> |
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| <a href="../reference/cdt_o_run_dbg_pages.htm">Run and Debug dialog box</a></p> |
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