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From: xmllmx on 22 Jun 2010 08:32
As we know, count_if() will never return a negative number. So, it
seems evident that the return type of count_if() should be "unsigned
integral type" rather than existing "signed integral type".

However, to my surprise, the C++ standard should define the return
type is "signed integer type", which causes a lot of conceptual
confusions and annoying compiling warnings such as "signed/unsigned
mismatch".

What's the rationale for the C++ standard committee to do so ?

Thanks in advance!

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