Re: Explicitly specializing std::min() on VC++ 2005 Express Edition

From:
"Matthias Hofmann" <hofmann@anvil-soft.com>
Newsgroups:
microsoft.public.vc.language
Date:
Thu, 3 May 2007 13:47:04 +0200
Message-ID:
<59u0f4F2la3j7U1@mid.individual.net>
"Victor Bazarov" <v.Abazarov@comAcast.net> schrieb im Newsbeitrag
news:f1apjp$vqi$1@news.datemas.de...

Add 'const' to the type of the object referred to by arguments:

template<> inline const char* const& min<>
( const char* const& a, const char* const& b) ...


If I do that, then the code compiles, but the specialization is not called
when I pass C-style strings:

#include <algorithm> // Defines std::min().
#include <cstring> // Defines std::strcmp().
#include <iostream> // Defines std::cout and std::endl.

namespace std
{
    template <> inline const char * const& min<>
    ( const char * const& a, const char * const& b )
    {
        return std::strcmp( a, b ) < 0 ? a : b;
    }
}

int main()
{
    // Non-const chars.
    char* p1 = "b";
    char* p2 = "a";

    // Calls primary template.
    std::cout << std::min( p1, p2 ) << std::endl;

    return 0;
}

It gets called, however, if I pass pointers to const chars:

// Chars are const now.
const char* p1 = "b";
const char* p2 = "a";

// Calls specialization.
std::cout << std::min( p1, p2 ) << std::endl;

--
Matthias Hofmann
Anvil-Soft, CEO
http://www.anvil-soft.com - The Creators of Toilet Tycoon
http://www.anvil-soft.de - Die Macher des Klomanagers

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