C++编译时整数变量的最小值和最大值

Question

是否有一种简单,干净的方法可以在编译时确定某些变量(此时是未知的)整数变量或类型的最大值和最小值？使用模板？

例如:

// Somewhere in a large project is:
typedef unsigned long XType;
typedef char YType;
// ...

// Somewhere else
   XType a;
   YType b;
   LONGLONG c,d,e,f;
   c = MinOfType(a); // Same as c = 0;
   d = MaxOfType(a); // Same as d = 0xffffffff;
   e = MinOfType(b); // Same as e = -128;
   f = MaxOfType(b); // Same as f = 127;
// Also would be nice
   e = MinOfType(YType); // Same as e = -128; // Using the typename directly
// Or perhaps
   e = MinOfType<YType>(); // Same as e = -128; // Using the typename directly

Answer 1

使用std :: numeric_limits,它就是这种类型的要求.您可以查看此示例以了解用法.

Answer 2

查看boost integer_traits.