TypeCast.h File Reference

#include "Concat.h"
#include <type_traits>
#include <utility>

Go to the source code of this file.

Classes
struct	auto_cast_trait< T >

Macros
#define	ADD_AUTO_CAST(From, To)   template <> struct auto_cast_trait<From> { using target_type = To; }
	helper macro to associate source and target types for auto-casting
#define	REGISTER_AUTO_CAST2(Type1, Type2)
	helper macro to associate two types mutually for auto-casting
#define	REGISTER_AUTO_CAST(Type)   REGISTER_AUTO_CAST2( Type, MR_CONCAT( MR, Type ) )
#define	ARG(X)   auto&& X = *auto_cast( MR_CONCAT( X, _ ) )
#define	ARG_PTR(X)   auto&& X = auto_cast( MR_CONCAT( X, _ ) )
	helper macro to cast a function argument from C pointer to C++ pointer
#define	ARG_VAL(X)   auto&& X = auto_cast( MR_CONCAT( X, _ ) )
	helper macro to cast a function argument from C pointer to C++ value
#define	ARG_OF(Type, X)   auto&& X = *cast_to<Type>( MR_CONCAT( X, _ ) )
	helper macro to cast a function argument from C pointer to C++ reference of specified type
#define	ARG_PTR_OF(Type, X)   auto&& X = cast_to<Type>( MR_CONCAT( X, _ ) )
	helper macro to cast a function argument from C pointer to C++ pointer of specified type
#define	ARG_VAL_OF(Type, X)   auto&& X = cast_to<Type>( MR_CONCAT( X, _ ) )
	helper macro to cast a function argument from C pointer to C++ value of specified type
#define	RETURN(...)   return auto_cast( __VA_ARGS__ )
	helper macro to auto-cast and return value
#define	RETURN_NEW(...)   return auto_cast( new_from( __VA_ARGS__ ) )
	helper function to allocate a new object of auto-detected type, auto-cast and return it
#define	RETURN_NEW_OF(Type, ...)   return auto_cast( new_from<Type>( __VA_ARGS__ ) )
	helper function to allocate a new object of specified type, auto-cast and return it

Functions
template<typename T , typename U >
auto	cast_to (U *from)
	helper functions to cast types without explicit qualifiers
template<typename T , typename U >
auto	cast_to (U &from)
template<typename T , typename U >
auto	cast_to (U &&from)
template<typename U >
auto	auto_cast (U &&from)
	helper function to cast to an associated type
template<typename T , typename U = std::remove_cvref_t<T>>
U *	new_from (T &&a)
	helper function to allocate a new object of auto-detected type

Macro Definition Documentation

ADD_AUTO_CAST

#define ADD_AUTO_CAST	(		From,
			To )   template <> struct auto_cast_trait<From> { using target_type = To; }

helper macro to associate source and target types for auto-casting

ARG

#define ARG

(

X

)

auto&& X = *auto_cast( MR_CONCAT( X, _ ) )

helper macro to cast a function argument from C pointer to C++ reference

int mrClassGetValue( const MRClass* obj_ )
{
    ARG( obj ); // declares `const Class& obj` variable and casts `obj_` to it
    return obj.GetValue();
}

ARG_OF

#define ARG_OF	(		Type,
			X )   auto&& X = *cast_to<Type>( MR_CONCAT( X, _ ) )

helper macro to cast a function argument from C pointer to C++ reference of specified type

ARG_PTR

#define ARG_PTR

(

X

)

auto&& X = auto_cast( MR_CONCAT( X, _ ) )

helper macro to cast a function argument from C pointer to C++ pointer

ARG_PTR_OF

#define ARG_PTR_OF	(		Type,
			X )   auto&& X = cast_to<Type>( MR_CONCAT( X, _ ) )

helper macro to cast a function argument from C pointer to C++ pointer of specified type

ARG_VAL

#define ARG_VAL

(

X

)

auto&& X = auto_cast( MR_CONCAT( X, _ ) )

helper macro to cast a function argument from C pointer to C++ value

ARG_VAL_OF

#define ARG_VAL_OF	(		Type,
			X )   auto&& X = cast_to<Type>( MR_CONCAT( X, _ ) )

helper macro to cast a function argument from C pointer to C++ value of specified type

REGISTER_AUTO_CAST

#define REGISTER_AUTO_CAST

(

Type

)

REGISTER_AUTO_CAST2( Type, MR_CONCAT( MR, Type ) )

REGISTER_AUTO_CAST2

#define REGISTER_AUTO_CAST2	(		Type1,
			Type2 )

Value:

ADD_AUTO_CAST( Type1, Type2 );              \
ADD_AUTO_CAST( Type2, Type1 );

helper macro to associate two types mutually for auto-casting

RETURN

#define RETURN

(

...

)

return auto_cast( __VA_ARGS__ )

helper macro to auto-cast and return value

RETURN_NEW

#define RETURN_NEW

(

...

)

return auto_cast( new_from( __VA_ARGS__ ) )

helper function to allocate a new object of auto-detected type, auto-cast and return it

RETURN_NEW_OF

#define RETURN_NEW_OF	(		Type,
			... )   return auto_cast( new_from<Type>( __VA_ARGS__ ) )

helper function to allocate a new object of specified type, auto-cast and return it

Function Documentation

auto_cast()

template<typename U >

auto auto_cast ( U && from )

inline

helper function to cast to an associated type

cast_to() [1/3]

template<typename T , typename U >

auto cast_to ( U && from )

inline

cast_to() [2/3]

template<typename T , typename U >

auto cast_to ( U & from )

inline

cast_to() [3/3]

template<typename T , typename U >

auto cast_to ( U * from )

inline

helper functions to cast types without explicit qualifiers

new_from()

template<typename T , typename U = std::remove_cvref_t<T>>

U * new_from ( T && a )

inline

helper function to allocate a new object of auto-detected type