用预处理器C++定义常见错误消息

很明显,要做的就是将错误消息放入 foo 本身。如果你做不到,就把它包起来:

bool fooWithLogging(int x, iny y)
{
    auto result = foo(x,y);
    if (result)
    {
        std::cerr << "Error occurred with values" << x << "," << y << std::endl;
    }
}

在代码中调用包装器:

void func1()
{
    ...
    fooWithLogging(x,y);
    ...
}

void func2()
{
    ...
    fooWithLogging(x,y);
    ...
}

奖励:使日志动态化:

#ifdef DEBUG
bool g_isFooLoggingEnabled = true;
#else
bool g_isFooLoggingEnabled = false;
#endif

bool fooWithLogging(int x, iny y)
{
    auto result = foo(x,y);
    if (result && g_isFooLoggingEnabled)
    {
        std::cerr << "Error occurred with values" << x << "," << y << std::endl;
    }
}

现在,您的文件和行要求刚刚在评论中提到:

bool _fooWithLogging(int x, iny y, const std::string& filename, int line)
{
    auto result = foo(x,y);
    if (result && g_isFooLoggingEnabled)
    {
        std::cerr << "Error occurred in file" << filename << " on line " << line << " with values" << x << "," << y << std::endl;
    }
}

#define FooWithLogging(x, y) _fooWithLogging(x, y, __FILE__, __LINE__)

然后在代码中:

void func1()
{
    ...
    FooWithLogging(x,y);
    ...
}