创建定义编译器变量并调用方法的C++宏

这是C++,尽量避免使用MACRO。通常有一些constexpr方法是可能的,比如这样:

#include <string_view>
#include <vector>
#include <iostream>
#include <format>

struct ExitCode
{
    int code;
    std::string_view name;
    std::string_view description;

    // implicit conversion to int (for interop with other API's)
    operator int() const noexcept
    {
        return code;
    }
};

std::ostream& operator<<(std::ostream& os, const ExitCode& err)
{
    os << std::format("Error : {}, description = {}", err.name, err.description);
    return os;
}

//-----------------------------------------------------------------------------

static constexpr ExitCode EXITCODE_SOMENAME{123,"SOMENAME","Description of code"};

// return a ref, all data will be put in by compiler (no dynamic mem alloc)
const ExitCode& SomeFunction()
{
    return EXITCODE_SOMENAME;
}

int main()
{
    auto& retval = SomeFunction();
    std::cout << retval << "\n";
    return retval; // implicit conversion to int here
}