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/**
* Provides classes for modeling typedefs and type aliases.
*/
import semmle.code.cpp.Type
private import semmle.code.cpp.internal.ResolveClass
/**
* A C/C++ typedef type. See 4.9.1. For example the types declared on each line of the following code:
* ```
* typedef int my_int;
* using my_int2 = int;
* ```
*/
class TypedefType extends UserType {
TypedefType() { usertypes(underlyingElement(this), _, 18) }
/**
* Gets the base type of this typedef type.
*/
Type getBaseType() { typedefbase(underlyingElement(this), unresolveElement(result)) }
override Type getUnderlyingType() { result = this.getBaseType().getUnderlyingType() }
override Type stripTopLevelSpecifiers() { result = this.getBaseType().stripTopLevelSpecifiers() }
override int getSize() { result = this.getBaseType().getSize() }
override int getAlignment() { result = this.getBaseType().getAlignment() }
override int getPointerIndirectionLevel() {
result = this.getBaseType().getPointerIndirectionLevel()
}
override predicate isDeeplyConst() { this.getBaseType().isDeeplyConst() } // Just an alias
override predicate isDeeplyConstBelow() { this.getBaseType().isDeeplyConstBelow() } // Just an alias
override Specifier internal_getAnAdditionalSpecifier() {
result = this.getBaseType().getASpecifier()
}
override predicate involvesReference() { this.getBaseType().involvesReference() }
override Type resolveTypedefs() { result = this.getBaseType().resolveTypedefs() }
override Type stripType() { result = this.getBaseType().stripType() }
}
/**
* A traditional C/C++ typedef type. See 4.9.1. For example the type declared in the following code:
* ```
* typedef int my_int;
* ```
*/
class CTypedefType extends TypedefType {
CTypedefType() { usertype_alias_kind(underlyingElement(this), 0) }
override string getAPrimaryQlClass() { result = "CTypedefType" }
override string explain() {
result = "typedef {" + this.getBaseType().explain() + "} as \"" + this.getName() + "\""
}
}
/**
* DEPRECATED: Use `TypeAlias` instead.
*
* A C++ type alias or alias template.
*
* For example the type declared in the following code:
* ```
* using my_int2 = int;
* ```
*/
deprecated class UsingAliasTypedefType = TypeAliasType;
/**
* A C++ type alias or alias template.
*
* For example the type declared in the following code:
* ```
* using my_int2 = int;
* ```
*/
class TypeAliasType extends TypedefType {
TypeAliasType() { usertype_alias_kind(underlyingElement(this), 1) }
override string getAPrimaryQlClass() { result = "TypeAliasType" }
override string explain() {
result = "using {" + this.getBaseType().explain() + "} as \"" + this.getName() + "\""
}
/**
* Holds if this alias is constructed from another alias as a result of
* template instantiation.
*/
predicate isConstructedFrom(TypeAliasType t) {
alias_instantiation(underlyingElement(this), unresolveElement(t))
}
}
/**
* A C++ alias template.
*
* For example the type declared in the following code:
* ```
* template <typename T>
* using my_type = T;
* ```
*/
class AliasTemplateType extends TypeAliasType {
AliasTemplateType() { is_alias_template(underlyingElement(this)) }
override string getAPrimaryQlClass() { result = "AliasTemplateType" }
/**
* Gets an alias instantiated from this template.
*
* For example for `MyAliasTemplate<T>` in the following code, the results are
* `MyAliasTemplate<int>` and `MyAliasTemplate<long>`:
* ```
* template<typename T>
* using MyAliasTemplate = ...;
*
* MyAliasTemplate<int> instance1;
*
* MyAliasTemplate<long> instance2;
* ```
*/
TypeAliasType getAnInstantiation() { result.isConstructedFrom(this) }
/**
* Gets the class member template this template was generated from.
*
* This predicate only has results for templates that are members of class
* template instantiations. For example, for `MyTemplateClass<int>::t<S>`
* in the following code, the result is `MyTemplateClass<T>::t<S>`.
* ```cpp
* template<class T>
* class MyTemplateClass {
* template<class S>
* using t = S;
* };
*
* template
* class MyTemplateClass<int>;
* ```
*/
AliasTemplateType getOriginalTemplate() {
alias_template_generated_from(underlyingElement(this), unresolveElement(result))
}
}
/**
* A C++ alias template instantiation.
*
* For example the `my_int_type` type declared in the following code:
* ```
* template <typename T>
* using my_type = T;
*
* using my_int_type = my_type<int>;
* ```
*/
class AliasTemplateInstantiationType extends TypeAliasType {
AliasTemplateType at;
AliasTemplateInstantiationType() { at.getAnInstantiation() = this }
override string getAPrimaryQlClass() { result = "AliasTemplateInstantiationType" }
/**
* Gets the alias template from which this instantiation was instantiated.
*/
AliasTemplateType getTemplate() { result = at }
}
/**
* A C++ `typedef` type that is directly enclosed by a function.
*
* For example the type declared inside the function `foo` in
* the following code:
* ```
* int foo(void) { typedef int local; }
* ```
*/
class LocalTypedefType extends TypedefType {
LocalTypedefType() { this.isLocal() }
override string getAPrimaryQlClass() { result = "LocalTypedefType" }
}
/**
* A C++ `typedef` type that is directly enclosed by a `class`, `struct` or `union`. For example the type declared inside
* the class `C` in the following code:
* ```
* class C { typedef int nested; };
* ```
*/
class NestedTypedefType extends TypedefType {
NestedTypedefType() { this.isMember() }
override string getAPrimaryQlClass() { result = "NestedTypedefType" }
}