CPlusPlus

Posted on Edited on

explicit

构造用explicit声明，防止非必要的隐式转换

reference &

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#include <iostream>

int main()
{
    int val = 1024;
    int &refVal = ival;

    int ii = val;

    std::cout << val << "  " << refVal << "  " << ii << std::endl;

    val = 1025;
    std::cout << val << "  " << refVal << "  " << ii << std::endl;

    refVal = 1026;
    std::cout << val << "  " << refVal << "  " << ii << std::endl;

    return 0;
}

// 1024  1024  1024
// 1025  1025  1024
// 1026  1026  1024