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better check for branch opt (#724)

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* Added c++17 test configurations for clang5.0 and clang6.0

* Simplified optimization in span::operator[]
This commit is contained in:
Anna Gringauze 2018-08-19 16:27:30 -07:00 committed by Neil MacIntosh
parent 86be2366c7
commit 585f48ce55
1 changed files with 1 additions and 2 deletions
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include/gsl/span
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@ -545,8 +545,7 @@ private:
// wrap around to a value always greater than size when casted.
// check if we have enough space to wrap around
if (narrow_cast<unsigned long long>(std::numeric_limits<index_type>::max()) <
narrow_cast<unsigned long long>(std::numeric_limits<size_t>::max()))
if (sizeof(index_type) <= sizeof(size_t))
{
return narrow_cast<size_t>(idx) < narrow_cast<size_t>(size);
}