to_string 未在范围内声明

问题描述

我试图让 to_string(NUMBER) 函数在我的 Ubuntu 计算机上工作数周，但它从来没有在 QT 环境或其他任何地方工作过.我的代码在 Mac osx 上运行良好，但是当我尝试在 Ubuntu 中运行它时，它抱怨 to_string 未在范围内声明.对此的任何解决方案将不胜感激.我试图更新 gcc 编译器，但它没有解决问题.请帮忙.

I am trying to make the to_string(NUMBER) function work in my Ubuntu computer for weeks but it never ever works in the QT environment or anywhere else. My code works perfectly on my Mac osx, but when I try running it in Ubuntu it complains that to_string is not declared in scope. Any solutions to this would be greatly appreciated. I have tried to update the gcc compiler but it didn't fix the problem. Please help.

我使用的是 QT Creator 4.8.1，我使用的是 C++ 和最新版本的 Ubuntu.

I am using QT Creator 4.8.1 and I am using C++ and latest version of Ubuntu.

int Bint::operator*(int temp){
    Bint b(to_string(temp));
    return ((*this)*b);
}

我在 pro 文件中遗漏了 QMAKE_CXXFLAGS += -std=c++0x.

I was missing the QMAKE_CXXFLAGS += -std=c++0x in the pro file.

推荐答案

它对您不起作用的原因可能有多种:也许您需要使用 std:: 限定名称，或者你可能没有 C++11 支持.

There could be different reasons why it doesn't work for you: perhaps you need to qualify the name with std::, or perhaps you do not have C++11 support.

如果你有 C++11 支持，这有效:

This works, provided you have C++11 support:

#include <string>

int main()
{
  std::string s = std::to_string(42);
}

要使用 g++ 或 clang 启用 C++11 支持，您需要传递选项 -std=c++0x.您还可以在这些编译器的较新版本上使用 -std=c++11.

To enable C++11 support with g++ or clang, you need to pass the option -std=c++0x. You can also use -std=c++11 on the newer versions of those compilers.

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