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properly test for to_format (respect inheritance)

master
Daniel Kolesa 2015-07-11 19:30:31 +01:00
parent 7b247c5c7b
commit b72e15a8d2
1 changed files with 4 additions and 14 deletions
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18
octa/format.hh
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@ -399,21 +399,11 @@ protected:
/* for cusotm container formatting */
namespace detail {
template<typename T, typename U>
struct ToFmtTest {
template<typename TT, typename UU,
bool (TT::*)(UU &, const FormatSpec &) const
> struct Test {};
template<typename TT, typename UU>
static char test(Test<TT, UU, &TT::template to_format<UU>> *);
template<typename, typename> static int test(...);
static constexpr bool value = (sizeof(test<T, U>(0)) == sizeof(char));
};
}
template<typename T, typename R, typename = EnableIf<
detail::ToFmtTest<T, R>::value
IsSame<decltype(declval<T>().to_format(declval<R &>(),
declval<const FormatSpec &>())),
bool
>::value
>> inline bool to_format(const T &v, R &writer, const FormatSpec &fs) {
return v.to_format(writer, fs);
}