在cppreference官网for_each的描述中,有这么一段话: For both overloads, if the iterator type (InputIt/ForwardIt) is mutable,fmay modify the elements of the range through the dereferenced iterator. Iffreturns a resul
ForwardIt first, Size n, UnaryFunc f); (2)(since C++17) Applies the given function objectfto the result of dereferencing every iterator in the range[first,first+n). Iffreturns a result, the result is ignored. 1)fis applied in order starting fromfirst. ...
} 3、for_each的用法 https://en.cppreference.com/w/cpp/algorithm/for_each的用法 std::for_each 提供了一种简洁且高效的方式来遍历容器中的元素,可以指定一个一元函数对每个元素执行指定的操作。 #include <algorithm> #include <iostream> #include <vector> int main() { std::vector<int> v{3, -4...
在下麵的程序中,我們使用 for_each() 替換了所有元音,它更有效並且隻需要 O(n)。 #include<bits/stdc++.h>usingnamespacestd;voidmyfunc(char& c){//to update reference is passedif(c =='a'|| c =='e'|| c =='i'|| c =='o'|| c =='o') c ='*'; }intmain(){stringstr ="includ...
for_each - C++ Referencewww.cplusplus.com/reference/algorithm/for_each/ 有: main.cpp // for_each example #include <iostream> // std::cout #include <algorithm> // std::for_each #include <vector> // std::vector void myfunction (int i) { // function: std::cout << ' ' << ...
Page Discussion std::ranges::for_each,std::ranges::for_each_result C++ Algorithm library Constrained algorithms, e.g.ranges::copy,ranges::sort, ... Constrained algorithms Defined in header<algorithm> Call signature template<std::input_iteratorI,std::sentinel_for<I>S,classProj=std::identity, ...
代码语言:cpp 复制 #include<iostream>#include<vector>#include<algorithm>intmain(){std::vector<int>v={1,2,3,4,5};std::for_each(v.begin(),v.end(),[](int&n){n++;});for(inti:v){std::cout<<i<<" ";}return0;} 在这个例子中,std::for_each将对每个元素调用lambda函数[](int...
<std::remove_cvref_t<ExecutionPolicy>> (C++20 起) 为 true 才参与重载决议。 对于两个重载,若迭代器类型为可变,则 f 可以通过解引用后的迭代器修改范围的元素。若 f 返回结果,则忽略结果。 不同于其余并行算法,不允许 for_each 复制序列中的元素,即使它们为可平凡复制。
(2)(since C++17) 1)Applies the given function objectfto the result of dereferencing every iterator in the range[first,first + n), in order. 2)Applies the given function objectfto the result of dereferencing every iterator in the range[first,first + n)(not necessarily in order). The algo...
在 C++ 标准库中，std::for_each() 算法函数提供了一种方便的方式来对容器范围内的元素执行指定的...