包含在c++標準庫中頭文件<algorithm>中，在頭文件<windows.h>中定義了min,max的宏，若在包含<algorithm>的同時包含<windows.h>會導致函數無法使用。
<windows.h>提供了_cpp_min等函數來代替min函數的功能。
C++11標準：<algorithm>中min函數的原型
| 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;
}