CodeQL library for C/C++
codeql/cpp-all 2.0.2 (changelog, source)
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Class Decltype

An instance of the C++11 decltype operator. For example:

int a;
decltype(a) b;

Import path

import cpp

Direct supertypes

Indirect supertypes

Known direct subtypes

    Predicates

    explain

    Gets a detailed string representation explaining the AST of this type (with all specifiers and nested constructs such as pointers). This is intended to help debug queries and is a very expensive operation; not to be used in production queries.

    getAPrimaryQlClass

    Gets the name of a primary CodeQL class to which this element belongs.

    getAlignment

    Gets the alignment of this type in bytes.

    getBaseType

    The type immediately yielded by this decltype.

    getExpr

    The expression whose type is being obtained by this decltype.

    getLocation

    Gets the primary location of this element.

    getName

    Gets the name of this type.

    getPointerIndirectionLevel

    Gets the pointer indirection level of this type.

    getSize

    Gets the size of this type in bytes.

    getUnderlyingType

    Gets this type after typedefs have been resolved.

    internal_getAnAdditionalSpecifier

    Internal – should be protected when QL supports such a flag. Subtypes override this to recursively get specifiers that are not attached directly to this @type in the database but arise through type aliases such as typedef and decltype.

    involvesReference

    Holds if this type involves a reference.

    involvesTemplateParameter

    Holds if this type involves a template parameter.

    isDeeplyConst

    Holds if this type is constant and only contains constant types. For instance, a char *const is a constant type, but not deeply constant, because while the pointer can’t be modified the character can. The type const char *const* is a deeply constant type though - both the pointer and what it points to are immutable.

    isDeeplyConstBelow

    Holds if this type is constant and only contains constant types, excluding the type itself. It is implied by Type.isDeeplyConst() and is just used to implement that predicate. For example, const char *const is deeply constant and deeply constant below, but const char * is only deeply constant below (the pointer can be changed, but not the underlying char). char *const is neither (it is just const).

    parenthesesWouldChangeMeaning

    Whether an extra pair of parentheses around the expression would change the semantics of this decltype.

    resolveTypedefs

    Gets this type with any typedefs resolved. For example, given typedef C T, this would resolve const T& to const C&. Note that this will only work if the resolved type actually appears on its own elsewhere in the program.

    stripTopLevelSpecifiers

    Gets this type after any top-level specifiers and typedefs have been stripped.

    stripType

    Gets the type stripped of pointers, references and cv-qualifiers, and resolving typedefs. For example, given typedef const C& T, stripType returns C.

    toString

    Gets a textual representation of this element.

    Inherited predicates

    findRootCause

    Gets the source of this element: either itself or a macro that expanded to this element.

    from Element
    fromSource

    Holds if this element may be from source. This predicate holds for all elements, except for those in the dummy file, whose name is the empty string. The dummy file contains declarations that are built directly into the compiler.

    from Element
    getASpecifier

    Gets a specifier of this type, recursively looking through typedef and decltype. For example, in the context of typedef const int *restrict t, the type volatile t has specifiers volatile and restrict but not const since the const is attached to the type being pointed to rather than the pointer itself.

    from Type
    getATypeNameUse

    Gets as many places as possible where this type is used by name in the source after macros have been replaced (in particular, therefore, this will find type name uses caused by macros). Note that all type name uses within instantiations are currently excluded - this is too draconian in the absence of indexing prototype instantiations of functions, and is likely to improve in the future. At present, the method takes the conservative approach of giving valid type name uses, but not necessarily all type name uses.

    from Type
    getAnAttribute

    Gets an attribute of this type.

    from Type
    getEnclosingElement

    Gets the closest Element enclosing this one.

    from Element
    getFile

    Gets the primary file where this element occurs.

    from Element
    getParentScope

    Gets the parent scope of this Element, if any. A scope is a Type (Class / Enum), a Namespace, a BlockStmt, a Function, or certain kinds of Statement.

    from Element
    getPrimaryQlClasses

    Gets a comma-separated list of the names of the primary CodeQL classes to which this element belongs.

    from ElementBase
    getUnspecifiedType

    Gets this type after specifiers have been deeply stripped and typedefs have been resolved.

    from Type
    hasName

    Holds if this type is called name.

    from Type
    hasSpecifier

    Holds if this declaration has a specifier called name, recursively looking through typedef and decltype. For example, in the context of typedef const int *restrict t, the type volatile t has specifiers volatile and restrict but not const since the const is attached to the type being pointed to rather than the pointer itself.

    from Type
    isAffectedByMacro

    Holds if this element is affected in any way by a macro. All elements that are totally or partially generated by a macro are included, so this is a super-set of isInMacroExpansion.

    from Element
    isConst

    Holds if this type is const.

    from Type
    isFromTemplateInstantiation

    Holds if this Element is a part of a template instantiation (but not the template itself).

    from Element
    isFromUninstantiatedTemplate

    Holds if this Element is part of a template template (not if it is part of an instantiation of template). This means it is represented in the database purely as syntax and without guarantees on the presence or correctness of type-based operations such as implicit conversions.

    from Element
    isInMacroExpansion

    Holds if this element comes from a macro expansion. Only elements that are entirely generated by a macro are included - for elements that partially come from a macro, see isAffectedByMacro.

    from Element
    isVolatile

    Holds if this type is volatile.

    from Type
    refersTo

    Holds if this type refers to type t (by default, a type always refers to itself).

    from Type
    refersToDirectly

    Holds if this type refers to type t directly.

    from Type