C++ to_string 未在范围内声明
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to_string not declared in scope
提问by Muhammad Sibghat Khan Oreo
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_stringis 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.
我试图使该to_string(NUMBER)功能在我的 Ubuntu 计算机上运行数周，但它从未在 QT 环境或其他任何地方运行。我的代码在我的 Mac osx 上完美运行，但是当我尝试在 Ubuntu 中运行它时，它抱怨to_string没有在范围内声明。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 using QT Creator 4.8.1 and I am using C++ and latest version of Ubuntu.
我使用的是 QT Creator 4.8.1，我使用的是 C++ 和最新版本的 Ubuntu。
int Bint::operator*(int temp){
Bint b(to_string(temp));
return ((*this)*b);
}
I was missing the QMAKE_CXXFLAGS += -std=c++0x in the pro file.
我在 pro 文件中缺少 QMAKE_CXXFLAGS += -std=c++0x 。
回答by juanchopanza
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.
它对您不起作用可能有不同的原因：也许您需要用 限定名称std::，或者您没有 C++11 支持。
This works, provided you have C++11 support:
如果您有 C++11 支持，这有效：
#include <string>
int main()
{
std::string s = std::to_string(42);
}
To enable C++11 support with g++ or clang, you need to pass the option -std=c++0x. You can also use -std=c++11on the newer versions of those compilers.
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-std=c++11在这些编译器的较新版本上使用。
回答by The Beast
you must compile the file with c++11 support
您必须使用 C++11 支持编译文件
g++ -std=c++0x -o test example.cpp
回答by MikeC
I fixed this problem by changing the first line in Application.mkfrom
我通过改变第一线固定这一问题Application.mk从
APP_STL := gnustl_static
to
到
APP_STL := c++_static
回答by ashwani nagar
You need to make some changes in the compiler. In Dev C++ Compiler: 1. Go to compiler settings/compiler Options. 2. Click on General Tab 3. Check the checkbox (Add the following commands when calling the compiler. 4. write -std=c++11 5. click Ok
您需要在编译器中进行一些更改。在 Dev C++ 编译器中： 1. 转到编译器设置/编译器选项。2. 点击General Tab 3. 勾选复选框（调用编译器时添加以下命令。4. write -std=c++11 5. 点击Ok
