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Allow string_view::at() to be constexpr again on VS2015

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VS2015 doesn't support extended constexpr. Thanks to Lastique for the
ternary trick
This commit is contained in:
Surogate 2016-12-12 23:45:34 +01:00
parent 38b536ff05
commit 38121f2af3
1 changed files with 1 additions and 7 deletions
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8
include/boost/utility/string_view.hpp
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@ -121,13 +121,7 @@ namespace boost {
BOOST_CONSTEXPR const_reference operator[](size_type pos) const BOOST_NOEXCEPT { return ptr_[pos]; }
BOOST_CONSTEXPR const_reference at(size_t pos) const {
#ifndef _MSC_VER
return pos >= len_ ? BOOST_THROW_EXCEPTION(std::out_of_range("boost::string_view::at")) : ptr_[pos];
#else
if (pos >= len_)
BOOST_THROW_EXCEPTION(std::out_of_range("boost::string_view::at"));
return ptr_[pos];
#endif
return pos >= len_ ? BOOST_THROW_EXCEPTION(std::out_of_range("boost::string_view::at")), ptr_[0] : ptr_[pos];
}
BOOST_CONSTEXPR const_reference front() const { return ptr_[0]; }