Re: log2 on MinGW

[John W. Eaton]

On 11/04/2013 12:05 PM, Rik wrote:

> Aside from performance, does using gnulib::frexp solve the original
> problem? The gnulib documentation is somewhat minimal and they suggest
> that they only replace an existing library function if the function is
> buggy. Otherwise, they fall back on the library version that is
> available. This may be, however, only when you use the bare function
> such as 'frexp' rather than the namespace-qualified version
> 'gnulib::frexp'.

The namespace thing allows gnulib to replace the function in C++ code 
without introducing macros that screw things up in other places.  But 
the replacement code is still only used if needed.  It works by using a 
function pointer in the namespace that either refers to the replacement 
function (usually called rpl_FOO) or the system function FOO.  So there 
shouldn't be much of a penalty if the system function is used.

jwe