彻底禁止gcc的“最终"建议警告("-Wsuggest-final-types"和"-Wsuggest-final-methods")

问题描述

我喜欢使用 -Wsuggest-final-types 和 -Wsuggest-final-methods ，以便在可能使用final关键字允许编译器更积极地进行优化的机会时得到警告.

I like compiling my code using -Wsuggest-final-types and -Wsuggest-final-methods in order to be warned about opportunities where the final keyword could be used to allow the compiler to optimize more aggressively.

有时候，建议是不正确的-例如，我有一个Base类，带有一个virtual ~Base()析构函数，该析构函数在另一个项目中被多态使用，而gcc建议我将Base标记为.

Sometimes, though, the suggestions are incorrect - for example, I have a class Base with a virtual ~Base() destructor that is used polymorphically in another project, and gcc suggests me that Base could be marked as final.

是否可以干净地"告诉编译器Base是多态使用的，不应将其标记为final?

Is there a way to "cleanly" tell the compiler that Base is used polymorphically and should not be marked as final?

我能想到的唯一方法是使用#pragma指令，但是我发现它使代码混乱且难以阅读.

The only way I can think of is using #pragma directives, but I find it makes the code cluttered and hard to read.

理想情况下，我正在寻找可以在类/方法声明之前/之后添加的non-final关键字或属性.

Ideally, I'm looking for a non-final keyword or attribute that can be prepended/appended to the class/method declaration.

推荐答案

我想出了一个我真的不喜欢的基于宏的解决方案，但是它解决了这个问题.

I came up with a macro-based solution that I really don't like, but it solves the problem.

#define MARK_NONFINAL_CLASS(base)                              \
    namespace SOME_UNIQUE_NAME                                 \
    {                                                          \
        struct [[unused]] temp_marker final : base             \
        {                                                      \
        };                                                     \
    }

#define MARK_NONFINAL_METHOD(base, return_type, method)                  \
    namespace SOME_UNIQUE_NAME                                           \
    {                                                                    \
        struct [[unused]] temp_marker final : base                       \
        {                                                                \
            inline return_type [[unused]] method override {}             \
        };                                                               \
    }

用法:

class Base
{
    virtual ~Base()
    {
    }

    virtual int a(float f)
    {
    }
    virtual void b(double)
    {
    }
};

MARK_NONFINAL_CLASS(Base)
MARK_NONFINAL_METHOD(Base, int, a(float))
MARK_NONFINAL_METHOD(Base, void, b(double))

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