valarray operator requirements not consistent with standard
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Key: STDCXX-622
URL: https://issues.apache.org/jira/browse/STDCXX-622
Project: C++ Standard Library
Issue Type: Bug
Components: 26. Numerics
Affects Versions: 4.2
Reporter: Travis Vitek
Assignee: Travis Vitek
Priority: Minor
Fix For: 4.2.1
26.3.2.6 p1 says
Each of these operators may only be instantiated for a type T to which the
indicated operator can be
applied. Each of these operators performs the indicated operation on each of
its elements and the corresponding
element of the argument array. [for operators *=, /=, %=, +=, -=, ^=, &=, |=,
<<= and >>=]
The current implementation of the valarray member operators violate these
requirements. Internally they use the transform algorithm with one of the
function adapters [i.e. multiplies, divides]. So valarray<T>::operator+=() will
use T::operator+() and T::operator=() when it should be using T::operator+=().
As a direct result of this, the 26.valarray.cassign test fails to compile on
all platforms.
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