C++静态库中的共享全局变量
我有一个 MS C++ 项目(我们称之为项目 A)，我目前正在将它编译为静态库 (.lib).它定义了一个全局变量 foo.我还有另外两个单独编译的项目(分别称为 B 和 C)，每个项目都将共享静态库 A 链接到其中. B 和 C 都是最终在同一进程中加载??的 dll.我想在同一进程中在 B 和 C 之间共享来自 A 的 foo 的单个实例:单例.我不知道如何在这里用项目 A 完成单例模式，因为它是分别静态编译到 B 和 C 中的.如果我在 B 和 C 中都将 foo 声明为 extern，我最终会在 B 和 C 中得到不同的实例.使用带有静态 getInstance 方法的标准、简单的单例类模式会导致两个静态 foo 实例化.
I have a MS C++ project (let's call it project A) that I am currently compiling as a static library (.lib). It defines a global variable foo. I have two other projects which compile separately (call them B and C, respectively) and each links the shared static library A in. Both B and C are dll's that end up loaded in the same process. I would like to share a single instance of foo from A between B and C in the same process: a singleton. I'm not sure how to accomplish the singleton pattern here with project A since it is statically compiled into B and C separately. If I declare foo as extern in both B and C, I end up with different instances in B and C. Using a standard, simple singleton class pattern with a static getInstance method results in two static foo instantiations.
当项目 A 被静态编译成 B 和 C 时，有什么办法可以做到这一点?还是必须将 A 设为 DLL?
Is there any way to accomplish this while project A is statically compiled into B and C? Or do I have to make A a DLL?
推荐答案
是的，您必须将 A 设为共享 DLL，否则将其定义为 B 和 C 中的 extern 并静态链接所有三个.
Yes, you have to make A a shared DLL, or else define it as extern in B and C and link all three statically.
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