c++ - 如何在 C++11 中定义强 ID 类型？

Question

如何在 C++11 中定义强 ID 类型？可以完成整数类型的别名，但在混合类型时会收到编译器的警告？

例如：

using monsterID = int;
using weaponID = int;

auto dragon = monsterID{1};
auto sword = weaponID{1};

dragon = sword; // I want a compiler warning here!!

if( dragon == sword ){ // also I want a compiler warning here!!
    // you should not mix weapons with monsters!!!
}

Answer 1

如果您使用的是 boost，请尝试BOOST_STRONG_TYPEDEF

文档中的示例：

BOOST_STRONG_TYPEDEF(int, a)
void f(int x);  // (1) function to handle simple integers
void f(a x);    // (2) special function to handle integers of type a 
int main(){
    int x = 1;
    a y;
    y = x;      // other operations permitted as a is converted as necessary
    f(x);       // chooses (1)
    f(y);       // chooses (2)
}