如果您愿意接受一些新增的语法，则可以使用:

If you are open to a bit of added syntax, you can use:

// No default implementation.
template <typename T, T value> struct Impl;

// Implement the bool/true version
template <> struct Impl<bool, true>
{
   void operator()() {}
};

// Implement the bool/false version
template <> struct Impl<bool, false>
{
   void operator()() {}
};

// Implement the int version
template <int N> struct Impl<int, N>
{
   void operator()() {}
};

template <typename T, T value>
void func()
{
   Impl<T, value>()();
};

int main()
{
   func<bool, true>();
   func<int, 10>();
}

免责声明

我不知道这样做是否会比调用func(true)更好.

I have no idea whether this will perform better than calling func(true).