c++ - 已弃用 API 调用的编译时检测？

Question

C++11 中是否有任何新的、很酷的功能允许我们在编译时检测现在标记为已弃用的 API 是否实际被某人调用？

从我读到的有关新 static_assert 功能的内容来看，它似乎不够灵活，无法用于此类分析。

但是我们还有什么可以用的吗？

可选地，boost 中是否有任何允许这种编译时检查的东西？

Answer 1

对于 C++14，您将有以下选择:

#include <iostream>

void foo( int v ) { std::cout << v << " "; }

[[deprecated("foo with float is deprecated")]]
void foo( float v ) { std::cout << v << " "; }

[[deprecated("you should not use counter anymore")]]
int counter {};

int main() {
  foo( ++counter );
  foo( 3.14f );
}

Clang 给出编译输出(here):

main.cpp:12:10: warning: 'counter' is deprecated [-Wdeprecated-declarations]
  foo( ++counter );
         ^
main.cpp:9:5: note: 'counter' has been explicitly marked deprecated here
int counter {};
    ^
main.cpp:13:3: warning: 'foo' is deprecated [-Wdeprecated-declarations]
  foo( 3.14f );
  ^
main.cpp:6:6: note: 'foo' has been explicitly marked deprecated here
void foo( float v ) { std::cout << v << " "; }
     ^
2 warnings generated.