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Fix handling of mapped types in compile checks (#1200)

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This commit is contained in:
Victor Zverovich
2019-06-16 16:06:06 -07:00
parent 4639843839
commit 4912cff65d
2 changed files with 17 additions and 6 deletions
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12
include/fmt/format.h
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@@ -2096,10 +2096,14 @@ FMT_CONSTEXPR void parse_format_string(basic_string_view<Char> format_str,
template <typename T, typename ParseContext>
FMT_CONSTEXPR const typename ParseContext::char_type* parse_format_specs(
ParseContext& ctx) {
// GCC 7.2 requires initializer.
typedef typename ParseContext::char_type char_type;
conditional_t<has_formatter<T, buffer_context<char_type>>::value,
formatter<T, char_type>,
using char_type = typename ParseContext::char_type;
using context = buffer_context<char_type>;
using mapped_type =
conditional_t<internal::mapped_type_constant<T, context>::value !=
internal::custom_type,
decltype(arg_mapper<context>().map(std::declval<T>())), T>;
conditional_t<has_formatter<mapped_type, context>::value,
formatter<mapped_type, char_type>,
internal::fallback_formatter<T, char_type>>
f;
return f.parse(ctx);