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CDictionary: fixed, enabled, and tested automatic selection of appropriate default implementation container.

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refs #281
This commit is contained in:
Mathew Sutcliffe
2014-07-01 21:04:40 +01:00
committed by Roland Winklmeier
parent 482ddf2081
commit ef93477a82
2 changed files with 85 additions and 3 deletions
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57
src/blackmisc/dictionary.h
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@@ -13,14 +13,67 @@
namespace BlackMisc
{
namespace Private
{
//! \cond PRIVATE
namespace ADL
{
struct NotFound {};
struct FromAny { template <class T> FromAny(const T &); };
NotFound operator <(const FromAny &, const FromAny &);
NotFound operator ==(const FromAny &, const FromAny &);
NotFound qHash(...);
template <class Key>
struct SupportsQHash : std::integral_constant<bool,
! std::is_same<decltype(std::declval<Key>() == std::declval<Key>()), NotFound>::value &&
! std::is_same<decltype(qHash(std::declval<Key>())), NotFound>::value
> {};
template <class Key>
struct SupportsQMap : std::integral_constant<bool,
! std::is_same<decltype(std::declval<Key>() < std::declval<Key>()), NotFound>::value
> {};
}
template <bool KeySupportsQHash /* = true */, bool KeySupportsQMap>
struct AssociativityTraits
{
template <class Key, class Value>
using DefaultType = QHash<Key, Value>;
};
template <>
struct AssociativityTraits<false, true>
{
template <class Key, class Value>
using DefaultType = QMap<Key, Value>;
};
template <>
struct AssociativityTraits<false, false>
{
template <class Key, class>
struct DefaultType { static_assert((std::is_void<Key>::value, false), "Key does not support either QHash or QMap"); };
};
//! \endcond
} // namespace Private
//! Trait to select the appropriate default associative container type depending on what the key type supports
template <class Key>
struct AssociativityTraits : public Private::AssociativityTraits<Private::ADL::SupportsQHash<Key>::value, Private::ADL::SupportsQMap<Key>::value>
{};
//! Associative container with value semantics, chooses a sensible default implementation container type
template<class Key, class Value, template <class...> class Impl>
template<class Key, class Value, template <class...> class Impl = AssociativityTraits<Key>::template DefaultType>
class CDictionary : public CValueObject
{
public:
//! The implementation container
typedef Impl<Key,Value> impl_type;
//! \brief STL compatibility
//! STL compatibility
//! @{
typedef Key key_type;
typedef Value value_type;