C++中的transform方法实在头文件<algorithm>中定义的,这个函数的作用就是将源区间的元素复制到目标区间,还能将两个区间的元素合并,并将结果写入目标区间。函数原型为: template<class InputIterator, class OutputIterator, class UnaryFunction> OutputIterator transform( InputIterator first1, InputIterator last1, ...
std::transform支持in place,即result和first1指向的位置可以是相同的。std::transform的主要作用应该就是省去了我们自己写for循环实现。 以下是摘自对std::transform的英文解释: /*// reference:http://en.cppreference.com/w/cpp/algorithm/transformtemplate< class InputIt, class OutputIt, class UnaryOperation...
Defined in header <algorithm> template< class InputIt, class OutputIt, class UnaryOperation > OutputIt transform( InputIt first1, InputIt last1, OutputIt d_first, UnaryOperation unary_op ); (1) template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2, class Unary...
#include<algorithm>#include<vector>#include<iostream>// 自定义函数，用于计算一个数的平方intsquare(...
cppreference.com 创建账户 页面 讨论 变换 查看 编辑 历史 std::transform C++ 算法库 包含算法例如ranges::copy,ranges::sort, ... 在标头<algorithm>定义 template<classInputIt,classOutputIt,classUnaryOp> OutputIt transform(InputIt first1, InputIt last1, ...
代码语言:cpp 代码运行次数:0 运行 AI代码解释 #include <iostream> #include <vector> #include <list> #include <algorithm> using namespace std; void print_element(int n) { cout << n << ' '; } void add_3(int &n) { n += 3; } int main(void) { int a[] = { 1, 2, 3, 4...
// alg_transform.cpp // compile with: /EHsc #include <vector> #include <algorithm> #include <functional> #include <iostream> // The function object multiplies an element by a Factor template <class Type> class MultValue { private: Type Factor; // The value to multiply by public: // ...
Defined in header<algorithm> template<classInputIt,classOutputIt,classUnaryOp> OutputIt transform(InputIt first1, InputIt last1, OutputIt d_first, UnaryOp unary_op); (1)(constexpr since C++20) template<classExecutionPolicy, classForwardIt1,classForwardIt2,classUnaryOp> ...
@param param1 First method-specific parameter. In case of #HOUGH_GRADIENT and #HOUGH_GRADIENT_ALT, it is the higher threshold of the two passed to the Canny edge detector (the lower one is twice smaller). Note that #HOUGH_GRADIENT_ALT uses #Scharr algorithm to compute image derivatives, ...
tolower的int类型不能被transform直接引用。要改成 char myLower(char u){ return tolower(static_cast<int>(u));} 就可以了