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W8012: Comparing signed and unsigned values (C++)
Example
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(Command-line option to suppress warning: -w-csu) 

Since the ranges of signed and unsigned types are different the result of an ordered comparison of an unsigned and a signed value might have an unexpected result. 

 

Example
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#pragma warn +csu
boolfoo(unsigned u, int i)
{
return u < i;
}
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