From: Howard Hinnant (hinnant_at_[hidden])
Date: 2001-11-05 12:43:32
On Monday, November 5, 2001, at 11:53 AM, Kevin Lynch wrote:
> I'm certainly willing to post something to the newsgroup along the lines
> of what I posted to the boost list; I'd certainly be willing to collect
> any suggestions other boosters have as well, and to try to present a
> more coherent version to the newsgroup that hopefully doesn't overlook
> anything of importance. Are there any other thoughts (particularly
> about math related issues) about migrating features from C99 into C++
> that people haven't posted yet? I'll wait two or three more days to see
> what pops up.
Both C90 and C99 handle integral types passed to math functions more
gracefully than does C++98. For example:
double x = cos(1); // ambiguous error in C++
// legal C90 and C99
This issue is explicitly addressed under C99's description of <tgmath.h>:
Use of the macro invokes a function whose generic parameters have the
real type determined as follows:
First, if any argument for generic parameters has type long double,
determined is long double.
Otherwise, if any argument for generic parameters has type double or
is of integer
type, the type determined is double.
Otherwise, the type determined is float.
Without at this time proposing a C++ solution, it would be nice if C++
also gracefully handled integral arguments to the math functions.
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