[Boost-bugs] [Boost C++ Libraries] #12896: [Utility] string_view's comparison operators are not marked "constexpr"

Subject: [Boost-bugs] [Boost C++ Libraries] #12896: [Utility] string_view's comparison operators are not marked "constexpr"
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-03-11 05:15:48

#12896: [Utility] string_view's comparison operators are not marked "constexpr"
-----------------------------------+---------------------------
 Reporter:  Zheng Luo              |      Owner:  no-maintainer
     Type:  Bugs                   |     Status:  new
Milestone:  To Be Determined       |  Component:  utility
  Version:  Boost 1.63.0           |   Severity:  Problem
 Keywords:  string_view,constexpr  |
-----------------------------------+---------------------------
 During the implementation of my GSoC static_map competency project, I
 found that in Boost 1.63, string_view's comparison operator was not marked
 as
 constexpr(http://www.boost.org/doc/libs/1_63_0/boost/utility/string_view.hpp).
 According to cppreference, string_view in C++17's standard library
 includes constexpr comparison operators, and actually the implementation
 of Boost's comparison operators calls constexpr compare() method. However,
 constexpr compare() in Boost never works in C++14, since it uses
 std::char_traits in standard library, of which char_traits::compare is not
 marked constexpr until C++17. It seems possible to backport C++17's
 constexpr char_traits into Boost's library.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/12896>
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