Represents a prvalue temporary that is written into memory so that a reference can bind to it. More...

#include "clang/AST/ExprCXX.h"

Inheritance diagram for clang::MaterializeTemporaryExpr:

[legend]

Public Member Functions
	MaterializeTemporaryExpr (QualType T, Expr Temporary, bool BoundToLvalueReference, LifetimeExtendedTemporaryDecl MTD=nullptr)

	MaterializeTemporaryExpr (EmptyShell Empty)

Expr *	getSubExpr () const
	Retrieve the temporary-generating subexpression whose value will be materialized into a glvalue.

StorageDuration	getStorageDuration () const
	Retrieve the storage duration for the materialized temporary.

APValue *	getOrCreateValue (bool MayCreate) const
	Get the storage for the constant value of a materialized temporary of static storage duration.

LifetimeExtendedTemporaryDecl *	getLifetimeExtendedTemporaryDecl ()

const LifetimeExtendedTemporaryDecl *	getLifetimeExtendedTemporaryDecl () const

ValueDecl *	getExtendingDecl ()
	Get the declaration which triggered the lifetime-extension of this temporary, if any.

const ValueDecl *	getExtendingDecl () const

void	setExtendingDecl (ValueDecl *ExtendedBy, unsigned ManglingNumber)

unsigned	getManglingNumber () const

bool	isBoundToLvalueReference () const
	Determine whether this materialized temporary is bound to an lvalue reference; otherwise, it's bound to an rvalue reference.

bool	isUsableInConstantExpressions (const ASTContext &Context) const
	Determine whether this temporary object is usable in constant expressions, as specified in C++20 [expr.const]p4.

SourceLocation	getBeginLoc () const LLVM_READONLY

SourceLocation	getEndLoc () const LLVM_READONLY

child_range	children ()

const_child_range	children () const

Public Member Functions inherited from clang::Expr
	Expr ()=delete

	Expr (const Expr &)=delete

	Expr (Expr &&)=delete

Expr &	operator= (const Expr &)=delete

Expr &	operator= (Expr &&)=delete

QualType	getType () const

void	setType (QualType t)

QualType	getEnumCoercedType (const ASTContext &Ctx) const
	If this expression is an enumeration constant, return the enumeration type under which said constant was declared.

ExprDependence	getDependence () const

bool	isValueDependent () const
	Determines whether the value of this expression depends on.

bool	isTypeDependent () const
	Determines whether the type of this expression depends on.

bool	isInstantiationDependent () const
	Whether this expression is instantiation-dependent, meaning that it depends in some way on.

bool	containsUnexpandedParameterPack () const
	Whether this expression contains an unexpanded parameter pack (for C++11 variadic templates).

bool	containsErrors () const
	Whether this expression contains subexpressions which had errors, e.g.

SourceLocation	getExprLoc () const LLVM_READONLY
	getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic expression.

bool	isReadIfDiscardedInCPlusPlus11 () const
	Determine whether an lvalue-to-rvalue conversion should implicitly be applied to this expression if it appears as a discarded-value expression in C++11 onwards.

bool	isUnusedResultAWarning (const Expr *&WarnExpr, SourceLocation &Loc, SourceRange &R1, SourceRange &R2, ASTContext &Ctx) const
	isUnusedResultAWarning - Return true if this immediate expression should be warned about if the result is unused.

bool	isLValue () const
	isLValue - True if this expression is an "l-value" according to the rules of the current language.

bool	isPRValue () const

bool	isXValue () const

bool	isGLValue () const

LValueClassification	ClassifyLValue (ASTContext &Ctx) const
	Reasons why an expression might not be an l-value.

isModifiableLvalueResult	isModifiableLvalue (ASTContext &Ctx, SourceLocation *Loc=nullptr) const
	isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, does not have an incomplete type, does not have a const-qualified type, and if it is a structure or union, does not have any member (including, recursively, any member or element of all contained aggregates or unions) with a const-qualified type.

Classification	Classify (ASTContext &Ctx) const
	Classify - Classify this expression according to the C++11 expression taxonomy.

Classification	ClassifyModifiable (ASTContext &Ctx, SourceLocation &Loc) const
	ClassifyModifiable - Classify this expression according to the C++11 expression taxonomy, and see if it is valid on the left side of an assignment.

FPOptions	getFPFeaturesInEffect (const LangOptions &LO) const
	Returns the set of floating point options that apply to this expression.

ExprValueKind	getValueKind () const
	getValueKind - The value kind that this expression produces.

ExprObjectKind	getObjectKind () const
	getObjectKind - The object kind that this expression produces.

bool	isOrdinaryOrBitFieldObject () const

void	setValueKind (ExprValueKind Cat)
	setValueKind - Set the value kind produced by this expression.

void	setObjectKind (ExprObjectKind Cat)
	setObjectKind - Set the object kind produced by this expression.

bool	refersToBitField () const
	Returns true if this expression is a gl-value that potentially refers to a bit-field.

FieldDecl *	getSourceBitField ()
	If this expression refers to a bit-field, retrieve the declaration of that bit-field.

EnumConstantDecl *	getEnumConstantDecl ()
	If this expression refers to an enum constant, retrieve its declaration.

const EnumConstantDecl *	getEnumConstantDecl () const

const FieldDecl *	getSourceBitField () const

Decl *	getReferencedDeclOfCallee ()

const Decl *	getReferencedDeclOfCallee () const

const ObjCPropertyRefExpr *	getObjCProperty () const
	If this expression is an l-value for an Objective C property, find the underlying property reference expression.

bool	isObjCSelfExpr () const
	Check if this expression is the ObjC 'self' implicit parameter.

bool	refersToVectorElement () const
	Returns whether this expression refers to a vector element.

bool	refersToMatrixElement () const
	Returns whether this expression refers to a matrix element.

bool	refersToGlobalRegisterVar () const
	Returns whether this expression refers to a global register variable.

bool	hasPlaceholderType () const
	Returns whether this expression has a placeholder type.

bool	hasPlaceholderType (BuiltinType::Kind K) const
	Returns whether this expression has a specific placeholder type.

bool	isKnownToHaveBooleanValue (bool Semantic=true) const
	isKnownToHaveBooleanValue - Return true if this is an integer expression that is known to return 0 or 1.

bool	isFlexibleArrayMemberLike (ASTContext &Context, LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel, bool IgnoreTemplateOrMacroSubstitution=false) const
	Check whether this array fits the idiom of a flexible array member, depending on the value of -fstrict-flex-array.

std::optional< llvm::APSInt >	getIntegerConstantExpr (const ASTContext &Ctx, SourceLocation *Loc=nullptr) const
	isIntegerConstantExpr - Return the value if this expression is a valid integer constant expression.

bool	isIntegerConstantExpr (const ASTContext &Ctx, SourceLocation *Loc=nullptr) const

bool	isCXX98IntegralConstantExpr (const ASTContext &Ctx) const
	isCXX98IntegralConstantExpr - Return true if this expression is an integral constant expression in C++98.

bool	isCXX11ConstantExpr (const ASTContext &Ctx, APValue Result=nullptr, SourceLocation Loc=nullptr) const
	isCXX11ConstantExpr - Return true if this expression is a constant expression in C++11.

bool	isConstantInitializer (ASTContext &Ctx, bool ForRef, const Expr **Culprit=nullptr) const
	isConstantInitializer - Returns true if this expression can be emitted to IR as a constant, and thus can be used as a constant initializer in C.

const ValueDecl *	getAsBuiltinConstantDeclRef (const ASTContext &Context) const
	If this expression is an unambiguous reference to a single declaration, in the style of __builtin_function_start, return that declaration.

bool	EvaluateAsRValue (EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
	EvaluateAsRValue - Return true if this is a constant which we can fold to an rvalue using any crazy technique (that has nothing to do with language standards) that we want to, even if the expression has side-effects.

bool	EvaluateAsBooleanCondition (bool &Result, const ASTContext &Ctx, bool InConstantContext=false) const
	EvaluateAsBooleanCondition - Return true if this is a constant which we can fold and convert to a boolean condition using any crazy technique that we want to, even if the expression has side-effects.

bool	EvaluateAsInt (EvalResult &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects, bool InConstantContext=false) const
	EvaluateAsInt - Return true if this is a constant which we can fold and convert to an integer, using any crazy technique that we want to.

bool	EvaluateAsFloat (llvm::APFloat &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects, bool InConstantContext=false) const
	EvaluateAsFloat - Return true if this is a constant which we can fold and convert to a floating point value, using any crazy technique that we want to.

bool	EvaluateAsFixedPoint (EvalResult &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects, bool InConstantContext=false) const
	EvaluateAsFixedPoint - Return true if this is a constant which we can fold and convert to a fixed point value.

bool	isEvaluatable (const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects) const
	isEvaluatable - Call EvaluateAsRValue to see if this expression can be constant folded without side-effects, but discard the result.

bool	HasSideEffects (const ASTContext &Ctx, bool IncludePossibleEffects=true) const
	HasSideEffects - This routine returns true for all those expressions which have any effect other than producing a value.

bool	hasNonTrivialCall (const ASTContext &Ctx) const
	Determine whether this expression involves a call to any function that is not trivial.

llvm::APSInt	EvaluateKnownConstInt (const ASTContext &Ctx, SmallVectorImpl< PartialDiagnosticAt > *Diag=nullptr) const
	EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded integer.

llvm::APSInt	EvaluateKnownConstIntCheckOverflow (const ASTContext &Ctx, SmallVectorImpl< PartialDiagnosticAt > *Diag=nullptr) const

void	EvaluateForOverflow (const ASTContext &Ctx) const

bool	EvaluateAsLValue (EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
	EvaluateAsLValue - Evaluate an expression to see if we can fold it to an lvalue with link time known address, with no side-effects.

bool	EvaluateAsInitializer (APValue &Result, const ASTContext &Ctx, const VarDecl *VD, SmallVectorImpl< PartialDiagnosticAt > &Notes, bool IsConstantInitializer) const
	EvaluateAsInitializer - Evaluate an expression as if it were the initializer of the given declaration.

bool	EvaluateWithSubstitution (APValue &Value, ASTContext &Ctx, const FunctionDecl Callee, ArrayRef< const Expr > Args, const Expr *This=nullptr) const
	EvaluateWithSubstitution - Evaluate an expression as if from the context of a call to the given function with the given arguments, inside an unevaluated context.

bool	EvaluateAsConstantExpr (EvalResult &Result, const ASTContext &Ctx, ConstantExprKind Kind=ConstantExprKind::Normal) const
	Evaluate an expression that is required to be a constant expression.

bool	tryEvaluateObjectSize (uint64_t &Result, ASTContext &Ctx, unsigned Type) const
	If the current Expr is a pointer, this will try to statically determine the number of bytes available where the pointer is pointing.

bool	tryEvaluateStrLen (uint64_t &Result, ASTContext &Ctx) const
	If the current Expr is a pointer, this will try to statically determine the strlen of the string pointed to.

bool	EvaluateCharRangeAsString (std::string &Result, const Expr SizeExpression, const Expr PtrExpression, ASTContext &Ctx, EvalResult &Status) const

std::optional< std::string >	tryEvaluateString (ASTContext &Ctx) const
	If the current Expr can be evaluated to a pointer to a null-terminated constant string, return the constant string (without the terminating null).

NullPointerConstantKind	isNullPointerConstant (ASTContext &Ctx, NullPointerConstantValueDependence NPC) const
	isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to a Null pointer constant.

bool	isOBJCGCCandidate (ASTContext &Ctx) const
	isOBJCGCCandidate - Return true if this expression may be used in a read/ write barrier.

bool	isBoundMemberFunction (ASTContext &Ctx) const
	Returns true if this expression is a bound member function.

Expr *	IgnoreUnlessSpelledInSource ()
	Skip past any invisible AST nodes which might surround this statement, such as ExprWithCleanups or ImplicitCastExpr nodes, but also injected CXXMemberExpr and CXXConstructExpr which represent implicit conversions.

const Expr *	IgnoreUnlessSpelledInSource () const

Expr *	IgnoreImpCasts () LLVM_READONLY
	Skip past any implicit casts which might surround this expression until reaching a fixed point.

const Expr *	IgnoreImpCasts () const

Expr *	IgnoreCasts () LLVM_READONLY
	Skip past any casts which might surround this expression until reaching a fixed point.

const Expr *	IgnoreCasts () const

Expr *	IgnoreImplicit () LLVM_READONLY
	Skip past any implicit AST nodes which might surround this expression until reaching a fixed point.

const Expr *	IgnoreImplicit () const

Expr *	IgnoreImplicitAsWritten () LLVM_READONLY
	Skip past any implicit AST nodes which might surround this expression until reaching a fixed point.

const Expr *	IgnoreImplicitAsWritten () const

Expr *	IgnoreParens () LLVM_READONLY
	Skip past any parentheses which might surround this expression until reaching a fixed point.

const Expr *	IgnoreParens () const

Expr *	IgnoreParenImpCasts () LLVM_READONLY
	Skip past any parentheses and implicit casts which might surround this expression until reaching a fixed point.

const Expr *	IgnoreParenImpCasts () const

Expr *	IgnoreParenCasts () LLVM_READONLY
	Skip past any parentheses and casts which might surround this expression until reaching a fixed point.

const Expr *	IgnoreParenCasts () const

Expr *	IgnoreConversionOperatorSingleStep () LLVM_READONLY
	Skip conversion operators.

const Expr *	IgnoreConversionOperatorSingleStep () const

Expr *	IgnoreParenLValueCasts () LLVM_READONLY
	Skip past any parentheses and lvalue casts which might surround this expression until reaching a fixed point.

const Expr *	IgnoreParenLValueCasts () const

Expr *	IgnoreParenNoopCasts (const ASTContext &Ctx) LLVM_READONLY
	Skip past any parentheses and casts which do not change the value (including ptr->int casts of the same size) until reaching a fixed point.

const Expr *	IgnoreParenNoopCasts (const ASTContext &Ctx) const

Expr *	IgnoreParenBaseCasts () LLVM_READONLY
	Skip past any parentheses and derived-to-base casts until reaching a fixed point.

const Expr *	IgnoreParenBaseCasts () const

bool	isDefaultArgument () const
	Determine whether this expression is a default function argument.

bool	isTemporaryObject (ASTContext &Ctx, const CXXRecordDecl *TempTy) const
	Determine whether the result of this expression is a temporary object of the given class type.

bool	isImplicitCXXThis () const
	Whether this expression is an implicit reference to 'this' in C++.

const CXXRecordDecl *	getBestDynamicClassType () const
	For an expression of class type or pointer to class type, return the most derived class decl the expression is known to refer to.

const Expr *	getBestDynamicClassTypeExpr () const
	Get the inner expression that determines the best dynamic class.

const Expr *	skipRValueSubobjectAdjustments (SmallVectorImpl< const Expr * > &CommaLHS, SmallVectorImpl< SubobjectAdjustment > &Adjustments) const
	Walk outwards from an expression we want to bind a reference to and find the expression whose lifetime needs to be extended.

const Expr *	skipRValueSubobjectAdjustments () const

Public Member Functions inherited from clang::ValueStmt
const Expr *	getExprStmt () const

Expr *	getExprStmt ()

Public Member Functions inherited from clang::Stmt
void *	operator new (size_t bytes, const ASTContext &C, unsigned alignment=8)

void *	operator new (size_t bytes, const ASTContext *C, unsigned alignment=8)

void *	operator new (size_t bytes, void *mem) noexcept

void	operator delete (void *, const ASTContext &, unsigned) noexcept

void	operator delete (void , const ASTContext , unsigned) noexcept

void	operator delete (void *, size_t) noexcept

void	operator delete (void , void ) noexcept

	Stmt ()=delete

	Stmt (const Stmt &)=delete

	Stmt (Stmt &&)=delete

Stmt &	operator= (const Stmt &)=delete

Stmt &	operator= (Stmt &&)=delete

	Stmt (StmtClass SC)

StmtClass	getStmtClass () const

const char *	getStmtClassName () const

SourceRange	getSourceRange () const LLVM_READONLY
	SourceLocation tokens are not useful in isolation - they are low level value objects created/interpreted by SourceManager.

SourceLocation	getBeginLoc () const LLVM_READONLY

SourceLocation	getEndLoc () const LLVM_READONLY

void	dump () const
	Dumps the specified AST fragment and all subtrees to `llvm::errs()`.

void	dump (raw_ostream &OS, const ASTContext &Context) const

int64_t	getID (const ASTContext &Context) const

void	dumpColor () const
	dumpColor - same as dump(), but forces color highlighting.

void	dumpPretty (const ASTContext &Context) const
	dumpPretty/printPretty - These two methods do a "pretty print" of the AST back to its original source language syntax.

void	printPretty (raw_ostream &OS, PrinterHelper Helper, const PrintingPolicy &Policy, unsigned Indentation=0, StringRef NewlineSymbol="\n", const ASTContext Context=nullptr) const

void	printPrettyControlled (raw_ostream &OS, PrinterHelper Helper, const PrintingPolicy &Policy, unsigned Indentation=0, StringRef NewlineSymbol="\n", const ASTContext Context=nullptr) const

void	printJson (raw_ostream &Out, PrinterHelper *Helper, const PrintingPolicy &Policy, bool AddQuotes) const
	Pretty-prints in JSON format.

void	viewAST () const
	viewAST - Visualize an AST rooted at this Stmt* using GraphViz.

Stmt *	IgnoreContainers (bool IgnoreCaptured=false)
	Skip no-op (attributed, compound) container stmts and skip captured stmt at the top, if IgnoreCaptured is true.

const Stmt *	IgnoreContainers (bool IgnoreCaptured=false) const

const Stmt *	stripLabelLikeStatements () const
	Strip off all label-like statements.

Stmt *	stripLabelLikeStatements ()

child_range	children ()

const_child_range	children () const

child_iterator	child_begin ()

child_iterator	child_end ()

const_child_iterator	child_begin () const

const_child_iterator	child_end () const

void	Profile (llvm::FoldingSetNodeID &ID, const ASTContext &Context, bool Canonical, bool ProfileLambdaExpr=false) const
	Produce a unique representation of the given statement.

void	ProcessODRHash (llvm::FoldingSetNodeID &ID, ODRHash &Hash) const
	Calculate a unique representation for a statement that is stable across compiler invocations.

Static Public Member Functions
static bool	classof (const Stmt *T)

Static Public Member Functions inherited from clang::Expr
static ExprValueKind	getValueKindForType (QualType T)
	getValueKindForType - Given a formal return or parameter type, give its value kind.

static bool	isPotentialConstantExpr (const FunctionDecl *FD, SmallVectorImpl< PartialDiagnosticAt > &Diags)
	isPotentialConstantExpr - Return true if this function's definition might be usable in a constant expression in C++11, if it were marked constexpr.

static bool	isPotentialConstantExprUnevaluated (Expr E, const FunctionDecl FD, SmallVectorImpl< PartialDiagnosticAt > &Diags)
	isPotentialConstantExprUnevaluated - Return true if this expression might be usable in a constant expression in C++11 in an unevaluated context, if it were in function FD marked constexpr.

static QualType	findBoundMemberType (const Expr *expr)
	Given an expression of bound-member type, find the type of the member.

static bool	hasAnyTypeDependentArguments (ArrayRef< Expr * > Exprs)
	hasAnyTypeDependentArguments - Determines if any of the expressions in Exprs is type-dependent.

static bool	isSameComparisonOperand (const Expr E1, const Expr E2)
	Checks that the two Expr's will refer to the same value as a comparison operand.

static bool	classof (const Stmt *T)

Static Public Member Functions inherited from clang::ValueStmt
static bool	classof (const Stmt *T)

Static Public Member Functions inherited from clang::Stmt
static void	addStmtClass (const StmtClass s)

static void	EnableStatistics ()

static void	PrintStats ()

static Likelihood	getLikelihood (ArrayRef< const Attr * > Attrs)

static Likelihood	getLikelihood (const Stmt *S)

static const Attr *	getLikelihoodAttr (const Stmt *S)

static Likelihood	getLikelihood (const Stmt Then, const Stmt Else)

static std::tuple< bool, const Attr , const Attr >	determineLikelihoodConflict (const Stmt Then, const Stmt Else)

Friends
class	ASTStmtReader

class	ASTStmtWriter

Additional Inherited Members
Public Types inherited from clang::Expr
enum	LValueClassification { LV_Valid , LV_NotObjectType , LV_IncompleteVoidType , LV_DuplicateVectorComponents , LV_InvalidExpression , LV_InvalidMessageExpression , LV_MemberFunction , LV_SubObjCPropertySetting , LV_ClassTemporary , LV_ArrayTemporary }

enum	isModifiableLvalueResult { MLV_Valid , MLV_NotObjectType , MLV_IncompleteVoidType , MLV_DuplicateVectorComponents , MLV_InvalidExpression , MLV_LValueCast , MLV_IncompleteType , MLV_ConstQualified , MLV_ConstQualifiedField , MLV_ConstAddrSpace , MLV_ArrayType , MLV_NoSetterProperty , MLV_MemberFunction , MLV_SubObjCPropertySetting , MLV_InvalidMessageExpression , MLV_ClassTemporary , MLV_ArrayTemporary }

enum	SideEffectsKind { SE_NoSideEffects , SE_AllowUndefinedBehavior , SE_AllowSideEffects }

enum class	ConstantExprKind { Normal , NonClassTemplateArgument , ClassTemplateArgument , ImmediateInvocation }

enum	NullPointerConstantKind { NPCK_NotNull = 0 , NPCK_ZeroExpression , NPCK_ZeroLiteral , NPCK_CXX11_nullptr , NPCK_GNUNull }
	Enumeration used to describe the kind of Null pointer constant returned from `isNullPointerConstant()`. More...

enum	NullPointerConstantValueDependence { NPC_NeverValueDependent = 0 , NPC_ValueDependentIsNull , NPC_ValueDependentIsNotNull }
	Enumeration used to describe how `isNullPointerConstant()` should cope with value-dependent expressions. More...

Public Types inherited from clang::Stmt
enum	StmtClass { NoStmtClass = 0 }

enum	Likelihood { LH_Unlikely = -1 , LH_None , LH_Likely }
	The likelihood of a branch being taken. More...

using	child_iterator = StmtIterator
	Child Iterators: All subclasses must implement 'children' to permit easy iteration over the substatements/subexpressions of an AST node.

using	const_child_iterator = ConstStmtIterator

using	child_range = llvm::iterator_range< child_iterator >

using	const_child_range = llvm::iterator_range< const_child_iterator >

Protected Types inherited from clang::Stmt
enum	{ NumStmtBits = 8 }

enum	{ NumExprBits = NumStmtBits + 5 + llvm::BitWidth<ExprDependence> }

enum	{ NumCallExprBits = 32 }

enum	{ NumOverloadExprBits = NumExprBits + 1 }

template<typename T >
using	ConstCastIterator = CastIterator< T, const T const, const Stmt const >
	Const iterator for iterating over Stmt * arrays that contain only T *.

using	ExprIterator = CastIterator< Expr >

using	ConstExprIterator = ConstCastIterator< Expr >

Protected Member Functions inherited from clang::Expr
	Expr (StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK)

	Expr (StmtClass SC, EmptyShell)
	Construct an empty expression.

void	setDependence (ExprDependence Deps)
	Each concrete expr subclass is expected to compute its dependence and call this in the constructor.

Protected Member Functions inherited from clang::ValueStmt
	Stmt (StmtClass SC, EmptyShell)
	Construct an empty statement.

	Stmt ()=delete

	Stmt (const Stmt &)=delete

	Stmt (Stmt &&)=delete

	Stmt (StmtClass SC)

Protected Member Functions inherited from clang::Stmt
void *	operator new (size_t bytes) noexcept

void	operator delete (void *data) noexcept

	Stmt (StmtClass SC, EmptyShell)
	Construct an empty statement.

Protected Attributes inherited from clang::Stmt
union {
StmtBitfields StmtBits

NullStmtBitfields NullStmtBits

CompoundStmtBitfields CompoundStmtBits

LabelStmtBitfields LabelStmtBits

AttributedStmtBitfields AttributedStmtBits

IfStmtBitfields IfStmtBits

SwitchStmtBitfields SwitchStmtBits

WhileStmtBitfields WhileStmtBits

DoStmtBitfields DoStmtBits

ForStmtBitfields ForStmtBits

GotoStmtBitfields GotoStmtBits

ContinueStmtBitfields ContinueStmtBits

BreakStmtBitfields BreakStmtBits

ReturnStmtBitfields ReturnStmtBits

SwitchCaseBitfields SwitchCaseBits

ExprBitfields ExprBits

ConstantExprBitfields ConstantExprBits

PredefinedExprBitfields PredefinedExprBits

DeclRefExprBitfields DeclRefExprBits

FloatingLiteralBitfields FloatingLiteralBits

StringLiteralBitfields StringLiteralBits

CharacterLiteralBitfields CharacterLiteralBits

UnaryOperatorBitfields UnaryOperatorBits

UnaryExprOrTypeTraitExprBitfields UnaryExprOrTypeTraitExprBits

ArrayOrMatrixSubscriptExprBitfields ArrayOrMatrixSubscriptExprBits

CallExprBitfields CallExprBits

MemberExprBitfields MemberExprBits

CastExprBitfields CastExprBits

BinaryOperatorBitfields BinaryOperatorBits

InitListExprBitfields InitListExprBits

ParenListExprBitfields ParenListExprBits

GenericSelectionExprBitfields GenericSelectionExprBits

PseudoObjectExprBitfields PseudoObjectExprBits

SourceLocExprBitfields SourceLocExprBits

StmtExprBitfields StmtExprBits

CXXOperatorCallExprBitfields CXXOperatorCallExprBits

CXXRewrittenBinaryOperatorBitfields CXXRewrittenBinaryOperatorBits

CXXBoolLiteralExprBitfields CXXBoolLiteralExprBits

CXXNullPtrLiteralExprBitfields CXXNullPtrLiteralExprBits

CXXThisExprBitfields CXXThisExprBits

CXXThrowExprBitfields CXXThrowExprBits

CXXDefaultArgExprBitfields CXXDefaultArgExprBits

CXXDefaultInitExprBitfields CXXDefaultInitExprBits

CXXScalarValueInitExprBitfields CXXScalarValueInitExprBits

CXXNewExprBitfields CXXNewExprBits

CXXDeleteExprBitfields CXXDeleteExprBits

TypeTraitExprBitfields TypeTraitExprBits

DependentScopeDeclRefExprBitfields DependentScopeDeclRefExprBits

CXXConstructExprBitfields CXXConstructExprBits

ExprWithCleanupsBitfields ExprWithCleanupsBits

CXXUnresolvedConstructExprBitfields CXXUnresolvedConstructExprBits

CXXDependentScopeMemberExprBitfields CXXDependentScopeMemberExprBits

OverloadExprBitfields OverloadExprBits

UnresolvedLookupExprBitfields UnresolvedLookupExprBits

UnresolvedMemberExprBitfields UnresolvedMemberExprBits

CXXNoexceptExprBitfields CXXNoexceptExprBits

SubstNonTypeTemplateParmExprBitfields SubstNonTypeTemplateParmExprBits

LambdaExprBitfields LambdaExprBits

RequiresExprBitfields RequiresExprBits

CoawaitExprBitfields CoawaitBits

ObjCIndirectCopyRestoreExprBitfields ObjCIndirectCopyRestoreExprBits

OpaqueValueExprBitfields OpaqueValueExprBits

};

Detailed Description

Represents a prvalue temporary that is written into memory so that a reference can bind to it.

Prvalue expressions are materialized when they need to have an address in memory for a reference to bind to. This happens when binding a reference to the result of a conversion, e.g.,

const int &r = 1.0;

Here, 1.0 is implicitly converted to an int. That resulting int is then materialized via a MaterializeTemporaryExpr, and the reference binds to the temporary. MaterializeTemporaryExprs are always glvalues (either an lvalue or an xvalue, depending on the kind of reference binding to it), maintaining the invariant that references always bind to glvalues.

Reference binding and copy-elision can both extend the lifetime of a temporary. When either happens, the expression will also track the declaration which is responsible for the lifetime extension.

Definition at line 4728 of file ExprCXX.h.

Constructor & Destructor Documentation

◆ MaterializeTemporaryExpr() [1/2]

MaterializeTemporaryExpr::MaterializeTemporaryExpr	(	QualType	T,
		Expr *	Temporary,
		bool	BoundToLvalueReference,
		LifetimeExtendedTemporaryDecl *	MTD = `nullptr`
	)