c ++ 0x:在lambda arity上重载

[capture](parameters) -> return_type { body }

#include <iostream>

int main() {
    auto lambda1 = []() { std::cout << "No parameters" << std::endl; };
    auto lambda2 = [](int x) { std::cout << "One parameter: " << x << std::endl; };
    auto lambda3 = [](int x, int y) { std::cout << "Two parameters: " << x << ", " << y << std::endl; };

    lambda1();
    lambda2(42);
    lambda3(1, 2);

    return 0;
}

No parameters
One parameter: 42
Two parameters: 1, 2