C++ 预处理器定义冲突

Question

#define object object() // object -> object()
#define none object     // none -> object -> object()
#define lambda (std::function<****>)[]()  // HOW?!, lambda -> (std::function<object(object, const char*)>)[]()

The problem:

#define object object() // object -> object() changes object to object() .

What i want is to make:

lambda -> (std::function<object(object, const char*)>)[]() .

But due to my previews macros object turns to object() .So i have:

(std::function<object()(object(), const char*)>)[]()

Is there a smarter way of doing this, maybe using #ifdef or something? I never used preprocessor macros before, so maybe am doing everything wrong. It seems it doesn't matter which one I #define first.

Answer 1

Short answer: every line of what you propose is bad practice, up to and including casting lambdas to std::function – the latter being a premature pessimization and almost never necessary nor useful.

Just write C++. It'll be clearer to everyone.

Your question is probably a classic XY problem: you're proposing a solution without stating what the problem is. The problem likely has a way easier solution or is not a problem to begin with.