1)按operator<(C++20 前)std::less{}(C++20 起)进行排序。 3)按comp进行排序。 2,4)同(1,3),但按照policy执行。 这些重载只有在满足以下所有条件时才会参与重载决议: std::is_execution_policy_v<std::decay_t<ExecutionPolicy>>是true。 (C++20 前) ...
https://en.cppreference.com/w/cpp/named_req/Compare中写道: 严格是说在判断的时候会用"<",而不是"<=" 1、sort的简单应用: sort - C++ Reference (cplusplus.com) //sort algorithm example#include <iostream>//std::cout#include <algorithm>//std::sort#include <vector>//std::vectorboolmyfunctio...
std::cout #include <algorithm> // std::sort #include <vector> // std::vector using namespace std; bool myfunction (int i,int j) { return (i>j); } int main () { vector<int> myvector = {32,71,12,45,26,80,53,33}; // using function as comp sort (my...
// sort using a standard library compare function object std::sort(s.begin(), s.end(), std::greater<int>()); for (int a : s) { std::cout << a << " "; } std::cout << '\n'; // sort using a custom function object struct { bool operator()(int a, int b) { return ...
c++ std::sort函数是经常被使用到的,但是不知道大家注意没有,定义的Compare函数是需要满足一定条件的。这个条件就是:strict weak ordering。 cppreference的英文原文: comparison function object (i.e. an object that satisfies the requirements ofCompare) which returns trueif the first argument islessthan ...
std::sort要求随机访问迭代器,因此不能用于list。此函数与std::sort的区别在于,它不要求list的元素类型可交换,维持所有迭代器的值,并进行稳定排序。 示例 运行此代码 #include <functional>#include <iostream>#include <list>std::ostream&operator<<(std::ostream&ostr,conststd::list<int>&list){for(constint...
// sort using a custom function object struct { bool operator()(int a, int b) { return a < b; } } customLess; std::sort(s.begin(), s.end(), customLess); for (int a : s) { std::cout << a << " "; } std::cout << '\n'; ...
当我们使用std::sort的时,如果提供了比较函数,要注意比较函数需要满足一定条件,否则可能会引发crash。 错误范例: #include <algorithm> #include <string> #include <vector> #include <iostream> using namespace std; bool cmp(const string& s1, const string& s2) ...
comp-comparison function object (i.e. an object that satisfies the requirements ofCompare) which returns trueif the first argument islessthan (i.e. is orderedbefore) the second. The signature of the comparison function should be equivalent to the following: ...
This comparator function must impose a strict weak ordering on pairs of elements from the sequence. For more information, see Algorithms. Remarks The range referenced must be valid; all pointers must be dereferenceable and within the sequence the last position is reachable from the first by ...