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Section: 28.7.1 [cmath.syn] Status: New Submitter: Jens Maurer Opened: 2016-12-15 Last modified: 2020-09-06
Priority: 3
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Discussion:
With P0175R1, we now show in [cmath.syn] three overloads for the sin function: One taking a float, one taking a double, and one taking a long double. However, there is no statement that sin(long double) should actually invoke sinl, presumably delivering extra precision.
An implementation like
inline long double sin(long double x)
{ return sinf(x); }
seems to satisfy the "effectively cast" requirement, but is certainly unintentional.
The same issue arises for all math functions inherited from C. (Source: Editorial issue #1247)[2017-01-27 Telecon]
Priority 3
Proposed resolution: