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ADL-respecting to_format

master
Daniel Kolesa 2015-07-11 19:14:12 +01:00
parent c34e81be56
commit 7b247c5c7b
1 changed files with 32 additions and 11 deletions
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43
octa/format.hh
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@ -397,6 +397,27 @@ protected:
char p_buf[32];
};
/* 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
>> inline bool to_format(const T &v, R &writer, const FormatSpec &fs) {
return v.to_format(writer, fs);
}
namespace detail {
template<typename R, typename T>
inline Ptrdiff write_u(R &writer, const FormatSpec *fl, bool neg, T val) {
@ -605,16 +626,16 @@ namespace detail {
Size p_written;
};
template<typename T, typename U>
struct FmtTofmtTest {
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>
static True test_tofmt(decltype(to_format(declval<const T &>(),
declval<R &>(),
declval<const FormatSpec &>())) *);
template<typename, typename>
static False test_tofmt(...);
template<typename T, typename R>
using FmtTofmtTest = decltype(test_tofmt<T, R>(0));
struct WriteSpec: FormatSpec {
WriteSpec(): FormatSpec() {}
@ -774,7 +795,7 @@ namespace detail {
EnableIf<FmtTofmtTest<T, FmtWriteRange<R>>::value, bool
> = true) {
FmtWriteRange<R> sink(writer);
if (!val.to_format(sink, *this)) return -1;
if (!to_format(val, sink, *this)) return -1;
return sink.get_written();
}