Karma::TIsDerivedFrom< DerivedType, BaseType > Struct Template Reference

Is type DerivedType inherited from BaseType? More...

#include <SubClassOf.h>

Public Types
typedef char	No[1]
typedef char	Yes[2]

Static Public Member Functions
static Yes &	Test (BaseType *)
	Handy function called when type-cast succeeds.
static Yes &	Test (const BaseType *)
	Handy variant function called when type-cast succeeds.
static No &	Test (...)
	Handy function called when type-cast does not succeed.
static DerivedType *	DerivedTypePtr ()

Static Public Attributes
static constexpr bool	Value = sizeof(Test(DerivedTypePtr())) == sizeof(Yes)
static constexpr bool	IsDerived = Value

Detailed Description

template<typename DerivedType, typename BaseType>
struct Karma::TIsDerivedFrom< DerivedType, BaseType >

Is type DerivedType inherited from BaseType?

Remarks

Note that this is a hierarchy detecting mechanism similar to UObjectBase::IsA while being used for different purpose of direct Class type. IsA is used for UClass hierarchy purpose used in game code (that we introduce by hand, more like uscript like hierarchy).

Member Typedef Documentation

No

template<typename DerivedType, typename BaseType>

typedef char Karma::TIsDerivedFrom< DerivedType, BaseType >::No[1]

When polymorphism fails, i.e there is no child-parent type relation for DerivedType and BaseType.

Yes

template<typename DerivedType, typename BaseType>

typedef char Karma::TIsDerivedFrom< DerivedType, BaseType >::Yes[2]

When polymorphism succeeds, i.e there is child-parent type relation for DerivedType and BaseType.

Member Function Documentation

DerivedTypePtr()

template<typename DerivedType, typename BaseType>

static DerivedType * Karma::TIsDerivedFrom< DerivedType, BaseType >::DerivedTypePtr ( )

inlinestatic

Makes a DerivedType ptr

Returns

pointer to DerivedType

Since

Karma 1.0.0

Test() [1/3]

template<typename DerivedType, typename BaseType>

static No & Karma::TIsDerivedFrom< DerivedType, BaseType >::Test ( ... )

static

Handy function called when type-cast does not succeed.

Parameters

...	Whatever the DerivedType is

Returns

No reference of specified size known from declaration and definition No.

Since

Karma 1.0.0

Test() [2/3]

template<typename DerivedType, typename BaseType>

static Yes & Karma::TIsDerivedFrom< DerivedType, BaseType >::Test ( BaseType * )

static

Handy function called when type-cast succeeds.

Parameters

someBaseType

Pointer to (type-cast) BaseType

Returns

Yes reference of specified size known from declaration and definition Yes.

Since

Karma 1.0.0

Test() [3/3]

template<typename DerivedType, typename BaseType>

static Yes & Karma::TIsDerivedFrom< DerivedType, BaseType >::Test ( const BaseType * )

static

Handy variant function called when type-cast succeeds.

Parameters

someBaseType

Pointer to (type-cast) const BaseType

Returns

Yes reference of specified size known from declaration and definition Yes.

Since

Karma 1.0.0

Member Data Documentation

Value

template<typename DerivedType, typename BaseType>

bool Karma::TIsDerivedFrom< DerivedType, BaseType >::Value = sizeof(Test(DerivedTypePtr())) == sizeof(Yes)

staticconstexpr

Test the derived type pointer. If it inherits from BaseType, the Test( BaseType* ) will be chosen. If it does not, Test( ... ) will be chosen.

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The documentation for this struct was generated from the following file:

• Karma/src/Karma/Core/SubClassOf.h