llvm::CastInfo< To, From, Enable > Struct Template Reference

This struct provides a method for customizing the way a cast is performed. More...

#include "llvm/Support/Casting.h"

Inheritance diagram for llvm::CastInfo< To, From, Enable >:

Public Types
using	Self = CastInfo< To, From, Enable >
using	CastReturnType = typename cast_retty< To, From >::ret_type

Static Public Member Functions
static CastReturnType	doCast (const From &f)
static CastReturnType	castFailed ()
static CastReturnType	doCastIfPossible (const From &f)
Static Public Member Functions inherited from llvm::CastIsPossible< To, From, Enable >
static bool	isPossible (const From &f)

Detailed Description

template<typename To, typename From, typename Enable = void>
struct llvm::CastInfo< To, From, Enable >

This struct provides a method for customizing the way a cast is performed.

It inherits from CastIsPossible, to support the case of declaring many CastIsPossible specializations without having to specialize the full CastInfo.

In order to specialize different behaviors, specify different functions in your CastInfo specialization. For isa<> customization, provide:

static bool isPossible(const From &f)

For cast<> customization, provide:

static To doCast(const From &f)

For dyn_cast<> and the *_if_present<> variants' customization, provide:

static To castFailed() and static To doCastIfPossible(const From &f)

Your specialization might look something like this:

template<> struct CastInfo<foo, bar> : public CastIsPossible<foo, bar> { static inline foo doCast(const bar &b) { return foo(const_cast<bar &>(b)); } static inline foo castFailed() { return foo(); } static inline foo doCastIfPossible(const bar &b) { if (!CastInfo<foo, bar>::isPossible(b)) return castFailed(); return doCast(b); } };

Definition at line 476 of file Casting.h.

Member Typedef Documentation

CastReturnType

template<typename To , typename From , typename Enable = void>

using llvm::CastInfo< To, From, Enable >::CastReturnType = typename cast_retty<To, From>::ret_type

Definition at line 479 of file Casting.h.

Self

template<typename To , typename From , typename Enable = void>

using llvm::CastInfo< To, From, Enable >::Self = CastInfo<To, From, Enable>

Definition at line 477 of file Casting.h.

Member Function Documentation

castFailed()

template<typename To , typename From , typename Enable = void>

static CastReturnType llvm::CastInfo< To, From, Enable >::castFailed ( )

inlinestatic

Definition at line 490 of file Casting.h.

Referenced by llvm::cast_if_present(), llvm::CastInfo< To, From, Enable >::doCastIfPossible(), and llvm::dyn_cast_if_present().

doCast()

template<typename To , typename From , typename Enable = void>

static CastReturnType llvm::CastInfo< To, From, Enable >::doCast ( const From &  f )

inlinestatic

Definition at line 481 of file Casting.h.

References From.

Referenced by llvm::cast(), and llvm::CastInfo< To, From, Enable >::doCastIfPossible().

doCastIfPossible()

template<typename To , typename From , typename Enable = void>

static CastReturnType llvm::CastInfo< To, From, Enable >::doCastIfPossible ( const From &  f )

inlinestatic

Definition at line 492 of file Casting.h.

References llvm::CastInfo< To, From, Enable >::castFailed(), llvm::CastInfo< To, From, Enable >::doCast(), and llvm::CastIsPossible< To, From, Enable >::isPossible().

Referenced by llvm::dyn_cast(), and llvm::dyn_cast_if_present().

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

• include/llvm/Support/Casting.h