C++中的Lambda | 姜康的技术博客

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语法

有以下几种形式:


[ captures ] ( params ) -> ret { body }

[ captures ] ( params ) { body }

[ captures ] { body }

其中captures表示捕获的外部变量,params是形式参数,ret是返回值的类型,body是表达式.

简单的demo


auto lambda1 = [](int a, int b) -> int {
    return a + b;
};

auto lambda2 = [] {
    std::cout << "Hello World" << std::endl;
};

auto lambda3 = [](int a, int b) {
    std::cout << a + b << std::endl;
};


int main(){
    std::cout << lambda1(1,2) << std::endl;
    lambda2();
    lambda3(2,3);


    int x = 32;
    auto lambda4 = [x](int y) -> int {
        return x + y;
    };
    std::cout << lambda4(12) << std::endl;

    auto f = lambda2;
    f();

    return 0;
}