Richard Hodges 21cdb11346 Fix value_to and value_from for MSVC-14.0: ...

close #465

value_to and value_from was incorrectly deducing that std::string was
"array-like" rather than "string-like", but only on msvc-14.0

Original test:

template<class T, typename std::enable_if<
    std::is_constructible<remove_cvref<T>, const char*, std::size_t>::value &&
    std::is_convertible<decltype(std::declval<T&>().data()), const char*>::value &&
    std::is_convertible<decltype(std::declval<T&>().size()), std::size_t>::value
>::type* = nullptr>

Which works for all compilers except msvc-14.0

New test:

template<class T, typename std::enable_if<
    std::is_constructible<remove_cvref<T>, const char*, std::size_t>::value &&
    std::is_convertible<decltype(std::declval<T&>().data()), const char*>::value &&
    std::is_integral<decltype(std::declval<T&>().size())>::value
>::type* = nullptr>

Note that each individual test works on all compilers. It seems to be
the conjuction of tests that caused msvc-14 to trip up.

2020-11-17 16:57:22 -08:00

..

boost

Fix value_to and value_from for MSVC-14.0:

2020-11-17 16:57:22 -08:00