包含在c++标准库中头文件<algorithm>中，在头文件<windows.h>中定义了min,max的宏，若在包含<algorithm>的同时包含<windows.h>会导致函数无法使用。
<windows.h>提供了_cpp_min等函数来代替min函数的功能。
C++11标准：<algorithm>中min函数的原型
| default (1) | template <class T> const T& min (const T& a, const T& b); |
|---|---|
| custom (2) | template <class T, class Compare> const T& min (const T& a, const T& b, Compare comp); |
| initializer list (3) | template <class T> T min (initializer_list<T> il); template <class T, class Compare> T min (initializer_list<T> il, Compare comp); |
Return the smallest
Returns the smallest of
a and
b. If both are equivalent,
a is returned.
The versions for initializer lists (3) return the smallest of all the elements in the list. Returning the first of them if these are more than one.
The function uses
operator< (or
comp, if provided) to compare the values.
eg:custom2<pre style="margin-top: 0px; margin-bottom: 0px; color: rgb(0, 128, 0);">template <class T, class Compare>
const T& min (const T& a, const T& b, Compare comp);#include<iostream>
#include<algorithm>
using namespace std;
struct var {
char *name;
int key;
var(char *a,int k):name(a),key(k){}
};
bool comp(const var& l, const var& r) {
return l.key < r.key;
}
int main() {
var v1("var1", 2);
var v2("var2", 3);
cout << std::min(v1, v2,comp).name << endl;
return 0;
}