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Change compare to be recursive in the case of nested calls to tie.

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refs #182
This commit is contained in:
Mathew Sutcliffe
2014-03-23 21:09:55 +00:00
parent 1dfb406d54
commit e1e024e62e
1 changed files with 42 additions and 6 deletions
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48
src/blackmisc/tuple_private.h
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@@ -29,6 +29,46 @@ namespace BlackMisc
namespace Private
{
#ifdef Q_COMPILER_VARIADIC_TEMPLATES
// Helper trait to detect whether a class is a tuple.
//! \private
//! @{
template <class T>
struct IsTuple : public std::false_type {};
template <class... Ts>
struct IsTuple<std::tuple<Ts...>> : public std::true_type {};
//! @}
#else // !Q_COMPILER_VARIADIC_TEMPLATES
template <class T>
struct IsTuple : public std::false_type {};
template <>
struct IsTuple<std::tuple<>> : public std::true_type {};
template <class T0>
struct IsTuple<std::tuple<T0>> : public std::true_type {};
template <class T0, class T1>
struct IsTuple<std::tuple<T0, T1>> : public std::true_type {};
template <class T0, class T1, class T2>
struct IsTuple<std::tuple<T0, T1, T2>> : public std::true_type {};
template <class T0, class T1, class T2, class T3>
struct IsTuple<std::tuple<T0, T1, T2, T3>> : public std::true_type {};
template <class T0, class T1, class T2, class T3, class T4>
struct IsTuple<std::tuple<T0, T1, T2, T3, T4>> : public std::true_type {};
template <class T0, class T1, class T2, class T3, class T4, class T5>
struct IsTuple<std::tuple<T0, T1, T2, T3, T4, T5>> : public std::true_type {};
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6>
struct IsTuple<std::tuple<T0, T1, T2, T3, T4, T5, T6>> : public std::true_type {};
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7>
struct IsTuple<std::tuple<T0, T1, T2, T3, T4, T5, T6, T7>> : public std::true_type {};
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
struct IsTuple<std::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8>> : public std::true_type {};
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9>
struct IsTuple<std::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>> : public std::true_type {};
#endif // !Q_COMPILER_VARIADIC_TEMPLATES
// Using SFINAE to help detect missing BLACK_ENABLE_TUPLE_CONVERSION macro in static_assert
//! \private
std::false_type hasEnabledTupleConversionHelper(...);
@@ -67,12 +107,8 @@ namespace BlackMisc
template <int N, class Tu>
int compareHelper(const Tu &a, const Tu &b)
{
typedef typename std::is_base_of <
CValueObject,
typename std::decay <
typename std::tuple_element<N, Tu>::type
>::type
>::type isCValueObjectTag;
typedef typename std::decay<typename std::tuple_element<N, Tu>::type>::type Element;
typedef std::integral_constant<bool, std::is_base_of<CValueObject, Element>::value || IsTuple<Element>::value> isCValueObjectTag;
return compareHelper(std::get<N>(a), std::get<N>(b), isCValueObjectTag());
}