Need a std::numeric_limits<T>::lowest() equivalent

[Xavier Bigand via Digitalmars-d]

Hi,

I am creating an AABB struct that should be initialized in an invalid 
state. Here is my actual code :

> struct AABB(type, int dimensions)
> {
> 	static assert(dimensions == 2 || dimensions == 3);
>
> 	VectorType	min = Vector!(type, 3)(type.max, type.max, type.max);
> 	VectorType	max = Vector!(type, 3)(-type.max, -type.max, -type.max);
>
> 	bool	isValid() const
> 	{
> 		return max >= min;
> 	}
>
> 	private alias VectorType = Vector!(type, dimensions);
>
> 	unittest
> 	{
> 		AABB2i	aabbInt;
> 		AABB2f	aabbFloat;
>
> 		assert(aabbInt.isValid == false);
> 		assert(aabbFloat.isValid == false);
> 	}
> }

Using -type.max is close to what I want but for integer int.min is 
different than -int.max.

In c++11 there is std::numeric_limits<T>::lowest() that works perfectly.

Can an equivalent property added to integer and floating types?

PS: I prefer to use border values to be sure that the AABB stay invalid 
with a partial initialization, else using -1 and 1 give the same result ;-)