core/com.nokia.carbide.cpp.compiler.doc.user/html/errors/err_redundent.htm
author timkelly
Thu, 10 Dec 2009 13:45:47 -0600
branchRCL_2_4
changeset 671 80524b72f957
parent 0 fb279309251b
child 1641 2b3996fc09a1
permissions -rw-r--r--
Add S60 5.2 support.

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<title>Redundant Statements</title>
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<h3>Redundant Statements</h3>
<p>  If you enable the pragma <a href="../pragmas/p_warn_no_side_effect.htm">warn_no_side_effect</a>, the compiler issues a warning when it encounters a statement that produces no side effect. To prevent a statement with no side effects from signalling this warning, cast the statement with (void). See Listing 6.12 for an example.</p>
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  <h5>Listing 6.12 Example of Pragma warn_no_side_effect</h5>
  <p>#pragma warn_no_side_effect on<br />
    void foo(int a,int b)<br />
    {<br />
    a+b; // warning: expression has no side effect<br />
    (void)(a+b); // void cast suppresses warning<br />
    }<br />
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