在C ++ 17中初始化后可以更改内联变量吗？ [英] Can an inline variable be changed after initialization in C++17?

问题描述

我的情况如下（它在clang中起作用，但在gcc中不起作用）

My scenario is the following (it worked in clang but not in gcc)

liba.hpp：

inline int MY_GLOBAL = 0;

libother.cpp：（dll）

libother.cpp: (dll)

#include "myliba.hpp"

void myFunc() {
    //
    MYGLOBAL = 28;
}

someexe.cpp：

someexe.cpp:

RunAppThatUsesBothLibAandLibOther();

问题是，内联变量在我期望28的地方显示为0，因为它被修改了在运行时。 MSVC对此表示不同意见，但是clang符合我的期望。

The problem is that the inline variable was showing 0 in places where I expected 28 because it was alrady modified at run-time. MSVC disagrees with this, but clang does the thing I would expect.

问题是：在我的方案中，可以在运行时修改内联变量吗？（我通过取消内联变量解决了问题。）

The question is: can inline variables be modified at run-time in my scenario? (I solved the problem by de-inlining the variable.)

推荐答案

是的，内联变量可以在初始化后进行修改。

Yes, inline variables can be modified after initialization.

但是，DLL在带有MSVC的Windows上很奇怪。近似地，每个DLL被建模为具有完全独立的运行时的自己的C ++程序。因此，主程序有一个 inline 变量的副本，而DLL是一个副本。

However, DLLs are strange things on Windows with MSVC. To a close approximation, each DLL is modelled as its own C++ program, with an entirely independent runtime. Therefore, there is one copy of your inline variable for the main program, and another for the DLL.

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