Re: [boost] Re: C++ Standard Library proposal - Math functions forStatistics

From: Gabriel Dos Reis (gdr_at_[hidden])
Date: 2003-04-17 04:30:52

Ross Smith <r-smith_at_[hidden]> writes:

[...]

| | 7.12.7.4 The pow functions
| | Synopsis
| |     #include <math.h>
| |     double pow(double x, double y);
| |     float powf(float x, float y);
| |     long double powl(long double x, long double y);
| | Description
| | The pow functions compute x raised to the power y. A domain error
| | occurs if x is finite and negative and y is finite and not an
| | integer value. A domain error may occur if x is zero and y is less
| | than or equal to zero. A range error may occur.
| | Returns
| |                           y
| | The pow functions return x .
| 
| C99 has no separate integer-exponent version of pow(), that one is 
| purely a C++ artifact.

So?

That C99 does not have integer-exponent version of pow() is a
deficient from my point of view.  And in effect, C library
implementations do internal checks to see whether the exponent is an
integer and branch accordingly.  I see the lack of that function in C
as an indirect consequence of lacking overloading.

-- Gaby