From:

Marco Manfredini <ok_nospam_ok@phoyd.net>

Newsgroups:

comp.lang.c++

Date:

Thu, 04 Sep 2008 19:27:37 +0200

Message-ID:

<1998249.d3Gzx7ZUm0@technoboredom.net>

Hi,

I'm wondering if there is a min function (in boost, maybe?) that

accepts any number of arguments? std::min only accepts two arguments.

If I want to get the minimum number out of many, I have use std::min

many times, which is not convenient.

I'm wondering if there is a min function (in boost, maybe?) that

accepts any number of arguments? std::min only accepts two arguments.

If I want to get the minimum number out of many, I have use std::min

many times, which is not convenient.

Well, if you really want it:

----------------

namespace peng_yu

{

template<typename T>

struct tmp_min_t

{

const T &item;

tmp_min_t(const T &n) : item(n) {}

operator const T& () const { return item; }

};

struct minimum_t {} minimum;

template<typename T>

inline tmp_min_t<T> operator , (minimum_t, const T &x)

{

return tmp_min_t<T>(x);

}

template<class T>

inline tmp_min_t<T> operator , (tmp_min_t<T> a, const T &x)

{

if (a.item<=x) return a;

else return tmp_min_t<T>(x);

}

}

#define MIN(...) (peng_yu::minimum,__VA_ARGS__)

#include <iostream>

int main()

{

std::cout

<< MIN(6,5,4,5,1,5,3,5,7,4,3,4,6,8,5,3,2,-23,5,2,2,4,6,4,4,3,4)

<< std::endl;

}

--------------

You'll need a compiler with C99-style variadic macro support though

(which is supported by most compilers I am aware of), or preprocess

your source accordingly.

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