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refs #876 Mostly-unrelated refactoring of metaclass flags.

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This commit is contained in:
Mathew Sutcliffe
2017-02-10 02:15:04 +00:00
parent 64f20f0141
commit 3d121ee052
1 changed files with 53 additions and 25 deletions
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78
src/blackmisc/metaclass.h
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@@ -36,7 +36,7 @@
using Class = CLASS; \
BLACK_NO_EXPORT_CONSTEXPR static auto getMemberList() \
{ \
return CMetaClass::makeMetaMemberList(__VA_ARGS__); \
return makeMetaMemberList(__VA_ARGS__); \
} \
}
@@ -53,7 +53,7 @@
* \ingroup MetaClass
*/
#define BLACK_METAMEMBER(MEMBER, ...) \
CMetaClass::makeMetaMember( \
makeMetaMember( \
&Class::m_##MEMBER, #MEMBER BLACK_TRAILING_VA_ARGS(__VA_ARGS__) \
)
@@ -64,7 +64,7 @@
* \ingroup MetaClass
*/
#define BLACK_METAMEMBER_NAMED(MEMBER, NAME, ...) \
CMetaClass::makeMetaMember( \
makeMetaMember( \
&Class::m_##MEMBER, NAME BLACK_TRAILING_VA_ARGS(__VA_ARGS__) \
)
@@ -73,32 +73,36 @@ namespace BlackMisc
class CVariant;
/*!
* Metadata flags attached to members of a meta class.
* \ingroup MetaClass
*/
enum MetaFlag
{
DisabledForComparison = 1 << 0, //!< Element will be ignored by compare() and comparison operators
DisabledForMarshalling = 1 << 1, //!< Element will be ignored during DBus marshalling
DisabledForDebugging = 1 << 2, //!< Element will be ignored when streaming to QDebug
DisabledForHashing = 1 << 3, //!< Element will be ignored by qHash()
DisabledForJson = 1 << 4, //!< Element will be ignored during JSON serialization
CaseInsensitiveComparison = 1 << 5 //!< Element will be compared case insensitively (must be a QString)
};
/*!
* Type wrapper for passing MetaFlag to CMetaClassIntrospector::with and CMetaClassIntrospector::without.
* \ingroup MetaClass
*/
template <quint64 F>
using MetaFlags = std::integral_constant<quint64, F>;
struct MetaFlags : public std::integral_constant<quint64, F>
{
//! Implicit conversion to std::false_type (if F is zero) or std::true_type (if F is non-zero).
constexpr operator std::integral_constant<bool, static_cast<bool>(F)>() const { return {}; }
};
/*!
* Compile-time union of MetaFlags.
* \ingroup MetaClass
*/
template <quint64 A, quint64 B>
constexpr MetaFlags<A | B> operator |(MetaFlags<A>, MetaFlags<B>) { return {}; }
/*!
* Compile-time intersection of MetaFlags.
* \ingroup MetaClass
*/
template <quint64 A, quint64 B>
constexpr MetaFlags<A & B> operator &(MetaFlags<A>, MetaFlags<B>) { return {}; }
/*!
* Literal aggregate type representing attributes of one member of a value class.
* \ingroup MetaClass
*/
template <typename M>
template <typename M, quint64 Flags>
struct CMetaMember
{
//! Pointer to the member.
@@ -112,11 +116,11 @@ namespace BlackMisc
const int m_index;
//! Any flags applying to the member.
const quint64 m_flags;
const MetaFlags<Flags> m_flags;
//! True if m_flags contains Flags.
template <typename Flags>
constexpr bool has(Flags) const { return (m_flags & Flags::value) == Flags::value; }
//! True if m_flags contains all flags.
template <typename Flags2>
constexpr bool has(Flags2 flags) const { return (m_flags & flags) == flags; }
//! Invoke the member on an instance of the value class.
template <typename T, typename... Ts>
@@ -150,6 +154,20 @@ namespace BlackMisc
}
};
/*!
* Metadata flags attached to members of a meta class.
* \ingroup MetaClass
*/
enum MetaFlag
{
DisabledForComparison = 1 << 0, //!< Element will be ignored by compare() and comparison operators
DisabledForMarshalling = 1 << 1, //!< Element will be ignored during DBus marshalling
DisabledForDebugging = 1 << 2, //!< Element will be ignored when streaming to QDebug
DisabledForHashing = 1 << 3, //!< Element will be ignored by qHash()
DisabledForJson = 1 << 4, //!< Element will be ignored during JSON serialization
CaseInsensitiveComparison = 1 << 5 //!< Element will be compared case insensitively (must be a QString)
};
/*!
* Base class for meta classes.
* Just static protected members to be used by derived meta classes.
@@ -158,6 +176,16 @@ namespace BlackMisc
class CMetaClass
{
protected:
//! Flags wrapped as compile-time constants.
//! @{
constexpr static MetaFlags<MetaFlag::DisabledForComparison> DisabledForComparison {};
constexpr static MetaFlags<MetaFlag::DisabledForMarshalling> DisabledForMarshalling {};
constexpr static MetaFlags<MetaFlag::DisabledForDebugging> DisabledForDebugging {};
constexpr static MetaFlags<MetaFlag::DisabledForHashing> DisabledForHashing {};
constexpr static MetaFlags<MetaFlag::DisabledForJson> DisabledForJson {};
constexpr static MetaFlags<MetaFlag::CaseInsensitiveComparison> CaseInsensitiveComparison {};
//! @}
//! Return a CMetaMemberList of type deduced from the types of the meta members.
//! Usually not used directly, but via the macros.
template <typename... Members>
@@ -168,8 +196,8 @@ namespace BlackMisc
//! Return a CMetaMethod of type deduced from the type of the member.
//! Usually not used directly, but via the macros.
template <typename M>
constexpr static CMetaMember<M> makeMetaMember(M ptrToMember, const char *name = nullptr, int index = 0, quint64 flags = 0)
template <typename M, quint64 Flags = 0>
constexpr static CMetaMember<M, Flags> makeMetaMember(M ptrToMember, const char *name = nullptr, int index = 0, MetaFlags<Flags> flags = {})
{
static_assert(std::is_member_object_pointer<M>::value, "M must be a pointer to member object");
return { ptrToMember, name, index, flags };