如何判断main函数是否被调用？

发布于 2024-11-13 06:31:09 字数 806 浏览 7 评论 0原文

我想编写一些依赖于静态变量值的代码。所以我想添加一些检查以消除从其他静态变量构造函数调用此代码的可能性。并永远防止静态初始化顺序惨败。例如：

static Foo foo = Foo();

// this function should be called ONLY from main program conrol flow
// ONLY after all static variable initialization was complete! ONLY!
int bar()
{
#ifdef _DEBUG
  if(! CRT_was_initialized_and_main_function_was_called ) ShowErrorMessage();
#endif
  if(foo.somefunction() == 2) return 0; else return -1;
}

//here inattentive programmer will caught error message during debug
const int barConstant = bar();

int main()
{
  //now all is fine
  const int barConstant = bar();
}

我该怎么做？如何检查我的函数是否在主函数之后被调用？

更新： Foo 对象有一个非常繁重的初始化代码，它可能会很慢，甚至抛出异常

更新2：这样做没有生命危险。栏前评论功能在大多数情况下都运行良好。我对某种调试检查感兴趣，以惩罚程序调试版本中不专心的程序员，而不是手动执行此操作。它可能是非标准的方式，比如调用一些只能在 MSVC 上运行的疯狂内置函数。

原文

I want to write some code which will depend on a static variable value. So I want to add some check to eliminate the possibility of calling this code from other static variable constructors. And prevent the static initialization order fiasco once and forever. For example:

static Foo foo = Foo();

// this function should be called ONLY from main program conrol flow
// ONLY after all static variable initialization was complete! ONLY!
int bar()
{
#ifdef _DEBUG
  if(! CRT_was_initialized_and_main_function_was_called ) ShowErrorMessage();
#endif
  if(foo.somefunction() == 2) return 0; else return -1;
}

//here inattentive programmer will caught error message during debug
const int barConstant = bar();

int main()
{
  //now all is fine
  const int barConstant = bar();
}

How can I do so? How to check whether my function was called after main function was?

UPDATE: Foo object have a very heavy initialization code, it could be slow and even throw an exception

UPDATE2: There is no life concern to do so. Comment before bar function worked fine most of the time. I interested in some sort of debug check to punish inattentive programmer in debug version of program instead of doing this manually. And it could be nonstandard way like a call to some crazy builtin function which will work only on MSVC.

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枕梦 2024-11-20 06:31:09

创建一个全局 bool 标志，指示 main 是否被调用，最初为 false。
在 main() 内将其更改为 true，并且仅在此处更改。这不是一个优雅的解决方案，但也是一个非常奇怪的问题的解决方案。

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画离情绘悲伤 2024-11-20 06:31:09

我会使用这个函数，并且 mainCalled 是一个全局布尔变量，默认情况下为 false，并在调用 main 时更改为 true：

int bar()
{
    static bool called = 0;
    if (!mainCalled)
        ShowErrorMessage();
    if (called)
    {
        return -1;
    }
    called = true;
    //do somthing
    return 0;
}

i would go with this function and mainCalled is a global boolean variable what is false by default and changed to true whever main is called:

int bar()
{
    static bool called = 0;
    if (!mainCalled)
        ShowErrorMessage();
    if (called)
    {
        return -1;
    }
    called = true;
    //do somthing
    return 0;
}

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