比较两个自动变量 [英] comparison of two auto variables

问题描述

#include <iostream>

using namespace std;

int main()
{
    auto a{1};
    auto b{1};
    if (a==b)
    {
        cout << "equal";
    }
    return 0;
}

为什么上述C ++代码在g ++编译器中返回一个错误， 11标准，而不是打印等于作为输出？

Why does the above C++ code return an error in g++ compiler with c++11 standard, instead of printing "equal" as output?

test.cpp：9：14：错误：无法匹配operator ==（操作数类型为std :: initializer_list和'std :: initializer_list'）
if（a == b）
^

test.cpp:9:14: error: no match for ‘operator==’ (operand types are ‘std::initializer_list’ and ‘std::initializer_list’) if (a==b) ^

推荐答案

您认为：

auto a{1};

是指编译器？

如果你认为它应该是整数你错了。编译器是懒惰的确定什么东西，它的initializer_list（正如你的错误所述）和 std :: initializer_list 没有 == 运算符定义（正如您的编译器所声明的）

If you think it's supposed to be integer you are wrong. Compilers are lazy in determining what things are, and it's initializer_list (just as your error stated) And std::initializer_list doesn't have == operator defined (just as your compiler stated)

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