TDPL: Overloading template functions

[Rainer Schuetze]

Andrej Mitrovic wrote:
> Woops, I got confused. I was thinking about structs, not arrays.
> 
> But yeah, in this case a float gets compared to a double and it seems to 
> evaluate to false.

2.4 has no exact representation as a floating point value, as it is 
2^^2*0.6, so the mantissa is 3/5. It is rounded after 24 bits for float, 
but after 53 bits for a double. As a result

	float f = 2.4; // approximately 2.4000001
	double d = 2.4; // approximately 2.3999999999999999
	assert(f == d);

fails, because the comparison is done after converting the truncated 
float to double (as long as the compiler does not issue SSE instructions 
with single precision).

In contrast, this

	assert(2.4 == 2.4f);

passes, as the compiler keeps real precision until writing the value to 
memory and evaluates the expression at compile time.