Sum { Sum() { sum = 0; } void operator()(int n) { sum += n; } int sum; }; int main() { std::vector<int> nums{3, 4, 2, 9, 15, 267}; std::cout << "до: "; for (auto n : nums) { std::cout << n << " "; } std::cout <
for_each(begin(vec), end(vec), [&] (int &i) { i = 0; } );//引用捕获方式,将每个值置0for(constauto &j : vec)//范围for循环打印cout<< j <<""; cout<<endl;return0; } 微软社区的一个示例: //alg_for_each.cpp//compile with: /EHsc#include <vector>#include<algorithm>#include<...
threads.push_back(std::thread(increase_global,1000));//分开写: thread t()// thread.push_back(t) 就无法编译通过,因为要用到operator= ,而 thread只允许move semnantics,就是只允许右值引用类似的 对于c++11里的foreach ,可以解释为 http://en.cppreference.com/w/cpp/language/range-for{ { auto &...
function object有很多種寫法,但只要是function object都可以跟for_each()合作。 3.member_function與for_each()搭配 3.1 不傳入參數 本文的重點來了,在物件導向世界裡,最常用的就是for_each()配合member function,這該怎麼寫呢?直覺會這樣子寫 for_each(_doorVec.begin(), _doorVec.end(),&Door::open); ...
std::for_each() for_each() 是一個非常有用的函數,它有助於在 STL 容器中的每個元素上調用函數 fn()。這實際上有助於編寫簡短的代碼並減少我們代碼庫的大小。 下麵是 for_each() 的語法, 用法: for_each( InputIterator first, InputIterator last, ...
std::for_each 编辑定义于头文件 <algorithm> (1) template< class InputIt, class UnaryFunction >UnaryFunction for_each( InputIt first, InputIt last, UnaryFunction f ); (C++20 前) template< class InputIt, class UnaryFunction >constexpr UnaryFunction for_each( InputIt first, InputIt ...
for_each(ivec.begin(), ivec.end(), printElem()); 26 } 執行結果 1 2 3 2.傳入參數 若使用function object,也可以將參數傳給printElem(),透過constructor的技巧接收參數。 1 /* 2 (C) OOMusou 2007http://oomusou.cnblogs.com 3 Filename : GenericAlgo_for_each_FunctionObjectWithParameter.cpp ...
(n>1)break;}std::cout<<"\n""6) constructors and destructors of objects created\n""in the loop's body are called per each iteration:\n";structS{S(intx,inty){std::cout<<"S::S("<<x<<", "<<y<<"); ";}~S(){std::cout<<"S::~S()\n";}};for(inti{0}, j{5};i<j...
// alg_for_each.cpp // compile with: /EHsc #include <vector> #include <algorithm> #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: // Constructor initializes ...
// for_each_string2.cpp// compile with: /clrusingnamespaceSystem; refstructMyClass{property String ^ MyStringProperty; };intmain(){ String ^ MyString = gcnew String("abcd");foreach( Char c in MyString ){ Console::Write(c); } Console::WriteLine(); MyClass ^x = gcnew MyClass();...