小编Pin*_*ing的帖子

我需要在编译时在代码中生成一系列序列号.我用这样的方式尝试了"__COUNTER__":

void test1()
{
  printf("test1(): Counter = %d\n", __COUNTER__);
}
void test2()
{
  printf("test2(): Counter = %d\n", __COUNTER__);
}
int main()
{
  test1();
  test2();
}

结果如我所料完美:

test1(): Counter = 0
test2(): Counter = 1

然后我在不同的.cpp文件中传播"__COUNTER__":

In Foo.cpp:
Foo::Foo()
{
  printf("Foo::Foo() with counter = %d\n", __COUNTER__);
}
In Bar.cpp:
Bar::Bar()
{
  printf("Bar::Bar() with counter = %d\n", __COUNTER__);
}

In Main.cpp:
int main()
{
  Foo foo;
  Bar bar;
}

结果是:

Foo::Foo() with counter = 0
Bar::Bar() with counter = 0

在我看来,"__ COUNTER__"作为 …