带单引号的整数文字? [英] Integer literal with single quotes?

问题描述

确切地赋给值的是什么?令我惊讶的是，它已经完全编译了.

What exactly as been assigned to value? I am surprised that this has compiled at all.

//g++  7.4.0

#include <iostream>

int main()
{
    auto value = 123'456'7;
    std::cout << value << std::endl;

    value += 1;
    std::cout << value << std::endl;
}

输出:

1234567
1234568

推荐答案

自C ++ 14起，

来自 https://en.cppreference.com/w/cpp/language/integer_literal

可以在数字之间插入可选的单引号(')作为分隔符.它们会被编译器忽略.

Optional single quotes(') may be inserted between the digits as a separator. They are ignored by the compiler.

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