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Merge pull request #1570 from geoffw0/qldoceg 

CPP: Add syntax examples to QLDoc in Class.qll.
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Jonas Jensen 2019-08-06 21:17:45 +02:00 коммит произвёл GitHub
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cpp/ql/src/semmle/code/cpp/Class.qll
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@ -8,7 +8,23 @@ private import semmle.code.cpp.internal.ResolveClass
* A class type [N4140 9].
*
* While this does include types declared with the `class` keyword, it also
* includes types declared with the `struct` and `union` keywords.
* includes types declared with the `struct` and `union` keywords. For example,
* the types `MyClass`, `MyStruct` and `MyUnion` in:
* ```
* class MyClass {
* public:
* MyClass();
* };
*
* struct MyStruct {
* int x, y, z;
* };
*
* union MyUnion {
* int i;
* float f;
* };
* ```
*/
class Class extends UserType {
Class() {
@ -16,23 +32,23 @@ class Class extends UserType {
}
override string getCanonicalQLClass() { result = "Class" }
/** Gets a child declaration of this class. */
/** Gets a child declaration of this class, struct or union. */
override Declaration getADeclaration() { result = this.getAMember() }
/** Gets a type declared in this class. */
/** Gets a type declared in this class, struct or union. */
UserType getANestedType() { result = this.getAMember() }
/**
* Gets a function declared in this class.
* For template member functions, results include both the template
* and the instantiations of that template. If you only want the
* template, then use `getACanonicalMemberFunction()` instead.
* Gets a function declared in this class, struct or union.
* For template member functions, results include both the template
* and the instantiations of that template. If you only want the
* template, then use `getACanonicalMemberFunction()` instead.
*/
MemberFunction getAMemberFunction() { result = this.getAMember() }
/**
* Gets a function declared in this class.
* Gets a function declared in this class, struct or union.
* For template member functions, results include only the template.
* If you also want instantiations of the template, then use
* `getAMemberFunction()` instead.
@ -42,7 +58,7 @@ class Class extends UserType {
}
/**
* Gets a member variable declared in this class.
* Gets a member variable declared in this class, struct or union.
* For template member variables, results include both the template
* and the instantiations of that template. If you only want the
* template, then use `getACanonicalMemberVariable()` instead.
@ -50,7 +66,7 @@ class Class extends UserType {
MemberVariable getAMemberVariable() { result = this.getAMember() }
/**
* Gets a member variable declared in this class.
* Gets a member variable declared in this class, struct or union.
* For template member variables, results include only the template.
* If you also want instantiations of the template, then use
* `getAMemberVariable()` instead.
@ -58,22 +74,23 @@ class Class extends UserType {
MemberVariable getACanonicalMemberVariable() { result = this.getAMember() }
/**
* Gets a member declared in this class. For template members, this
* may be either the template or an instantiation of that template.
* If you only want the template, see
* Gets a member declared in this class, struct or union.
* For template members, this may be either the template or an instantiation
* of that template. If you only want the template, see
* `getACanonicalMember()`.
*/
Declaration getAMember() { result = this.getAMember(_) }
/**
* Gets a member declared in this class.
* Gets a member declared in this class, struct or union.
* If you also want template instantiations of results, see
* `getAMember()`.
*/
Declaration getACanonicalMember() { result = this.getCanonicalMember(_) }
/**
* Gets the (zero-based) `index`th member declared in this class.
* Gets the (zero-based) `index`th member declared in this class, struct
* or union.
* If you also want template instantiations of results, see
* `getAMember(int)`.
*/
@ -81,8 +98,8 @@ class Class extends UserType {
/**
* Gets the (zero-based) `index`th canonical member declared in this
* class and, if that member is a template, all instantiations of that
* template. If you only want the canonical member, see
* class, struct or union. If that member is a template, all instantiations
* of that template. If you only want the canonical member, see
* `getCanonicalMember(int)`.
*/
Declaration getAMember(int index) {
@ -109,7 +126,7 @@ class Class extends UserType {
deprecated int getNumMember() { result = count(this.getAMember()) }
/**
* Gets a private member declared in this class.
* Gets a private member declared in this class, struct or union.
* For template members, this may be either the template or an
* instantiation of that template. For just the template, use
* `getAPrivateCanonicalMember()`.
@ -119,7 +136,7 @@ class Class extends UserType {
}
/**
* Gets a private canonical member declared in this class.
* Gets a private canonical member declared in this class, struct or union.
* If you also want template instantiations of results, see
* `getAPrivateMember()`.
*/
@ -128,7 +145,7 @@ class Class extends UserType {
}
/**
* Gets a protected member declared in this class.
* Gets a protected member declared in this class, struct or union.
* For template members, this may be either the template or an
* instantiation of that template. For just the template, use
* `getAProtectedCanonicalMember()`.
@ -138,7 +155,7 @@ class Class extends UserType {
}
/**
* Gets a protected canonical member declared in this class.
* Gets a protected canonical member declared in this class, struct or union.
* If you also want template instantiations of results, see
* `getAProtectedMember()`.
*/
@ -147,7 +164,7 @@ class Class extends UserType {
}
/**
* Gets a public member declared in this class.
* Gets a public member declared in this class, struct or union.
* For template members, this may be either the template or an
* instantiation of that template. For just the template, use
* `getAPublicCanonicalMember()`.
@ -157,7 +174,7 @@ class Class extends UserType {
}
/**
* Gets a public canonical member declared in this class.
* Gets a public canonical member declared in this class, struct or union.
* If you also want template instantiations of results, see
* `getAPublicMember()`.
*/
@ -165,18 +182,18 @@ class Class extends UserType {
result = this.getACanonicalMember() and result.hasSpecifier("public")
}
/** Gets a static member declared in this class. */
/** Gets a static member declared in this class, struct or union. */
Declaration getAStaticMember() {
result = this.getAMember() and result.isStatic()
}
/** Gets a field of this class. */
/** Gets a field of this class, struct or union. */
Field getAField() { result = this.getAMemberVariable() }
/** Gets a constructor of this class. */
/** Gets a constructor of this class, struct or union. */
Constructor getAConstructor() { result = this.getAMemberFunction() }
/** Holds if this class has a constructor. */
/** Holds if this class, struct or union has a constructor. */
predicate hasConstructor() { exists(this.getAConstructor()) }
/**
@ -274,12 +291,12 @@ class Class extends UserType {
}
/**
* Holds if this class has an implicitly-declared copy constructor that is
* not _deleted_. This predicate is more accurate than checking
* if this class has a `CopyConstructor cc` where `cc.isCompilerGenerated()`
* since such a `CopyConstructor` may not exist in the database if (1) it is
* never called or (2) it is _trivial_, meaning that it is equivalent to
* `memcpy`.
* Holds if this class, struct or union has an implicitly-declared copy
* constructor that is not _deleted_. This predicate is more accurate than
* checking if this class, struct or union has a `CopyConstructor cc` where
* `cc.isCompilerGenerated()` since such a `CopyConstructor` may not exist
* in the database if (1) it is never called or (2) it is _trivial_, meaning
* that it is equivalent to `memcpy`.
*/
predicate hasImplicitCopyConstructor() {
not this.implicitCopyConstructorDeleted() and
@ -289,12 +306,12 @@ class Class extends UserType {
}
/**
* Holds if this class has an implicitly-declared copy assignment operator
* that is not _deleted_. This predicate is more accurate than checking
* if this class has a `CopyAssignmentOperator ca` where
* `ca.isCompilerGenerated()` since such a `CopyAssignmentOperator` may not
* exist in the database if (1) it is never called or (2) it is _trivial_,
* meaning that it is equivalent to `memcpy`.
* Holds if this class, struct or union has an implicitly-declared copy
* assignment operator that is not _deleted_. This predicate is more
* accurate than checking if this class, struct or union has a
* `CopyAssignmentOperator ca` where `ca.isCompilerGenerated()` since such a
* `CopyAssignmentOperator` may not exist in the database if (1) it is never
* called or (2) it is _trivial_, meaning that it is equivalent to `memcpy`.
*/
predicate hasImplicitCopyAssignmentOperator() {
not this.implicitCopyAssignmentOperatorDeleted() and
@ -305,7 +322,8 @@ class Class extends UserType {
/**
* Holds if the compiler would be unable to generate a copy constructor for
* this class. This predicate implements the rules listed here:
* this class, struct or union. This predicate implements the rules listed
* here:
* http://en.cppreference.com/w/cpp/language/copy_constructor#Deleted_implicitly-declared_copy_constructor
*/
predicate implicitCopyConstructorDeleted() {
@ -350,7 +368,8 @@ class Class extends UserType {
/**
* Holds if the compiler would be unable to generate a copy assignment
* operator for this class. This predicate implements the rules listed here:
* operator for this class, struct or union. This predicate implements the
* rules listed here:
* http://en.cppreference.com/w/cpp/language/copy_assignment#Deleted_implicitly-declared_copy_assignment_operator
*/
predicate implicitCopyAssignmentOperatorDeleted() {
@ -404,14 +423,15 @@ class Class extends UserType {
// Not implemented
}
/** Gets the destructor of this class, if any. */
/** Gets the destructor of this class, struct or union, if any. */
Destructor getDestructor() { result = this.getAMemberFunction() }
/** Holds if this class has a destructor. */
/** Holds if this class, struct or union has a destructor. */
predicate hasDestructor() { exists(this.getDestructor()) }
/**
* Holds if this class is a POD (Plain Old Data) class [N4140 9(10)].
* Holds if this class, struct or union is a POD (Plain Old Data) class
* [N4140 9(10)].
*
* The definition of POD changed between C++03 and C++11, so whether
* a class is POD can depend on which version of the language it was
@ -421,24 +441,24 @@ class Class extends UserType {
predicate isPOD() { is_pod_class(underlyingElement(this)) }
/**
* Holds if this class is a standard-layout class [N4140 9(7)]. Also holds
* for structs in C programs.
* Holds if this class, struct or union is a standard-layout class
* [N4140 9(7)]. Also holds for structs in C programs.
*/
predicate isStandardLayout() { is_standard_layout_class(underlyingElement(this)) }
/**
* Holds if this class is abstract, in other words whether it declares one
* or more pure virtual member functions.
* Holds if this class/struct is abstract, in other words whether
* it declares one or more pure virtual member functions.
*/
predicate isAbstract() { this.getAMemberFunction() instanceof PureVirtualFunction }
/** Gets a direct base class of this class [N4140 10]. */
/** Gets a direct base class/struct of this class/struct [N4140 10]. */
Class getABaseClass() { this.getADerivation().getBaseClass() = result }
/** Gets a class that is directly derived from this class [N4140 10]. */
/** Gets a class/struct that is directly derived from this class/struct [N4140 10]. */
Class getADerivedClass() { result.getABaseClass() = this }
/** Holds if this class derives directly from that. */
/** Holds if this class/struct derives directly from that. */
predicate derivesFrom(Class that) {
this.getABaseClass() = that
}
@ -449,8 +469,13 @@ class Class extends UserType {
}
/**
* Gets a class derivation of this class, for example the "public B"
* in "class D : public B { ... };".
* Gets a class derivation of this class/struct, for example the
* `public B` in the following code:
* ```
* class D : public B {
* ...
* };
* ```
*/
ClassDerivation getADerivation() {
exists(ClassDerivation d | d.getDerivedClass() = this and d = result)
@ -501,8 +526,13 @@ class Class extends UserType {
}
/**
* Holds if this class has a virtual class derivation, for example the
* "virtual public B" in "class D : virtual public B { ... };".
* Holds if this class/struct has a virtual class derivation, for
* example the `virtual public B` in the following code:
* ```
* class D : virtual public B {
* ...
* };
* ```
*/
predicate hasVirtualBaseClass(Class base) {
exists(ClassDerivation cd |
@ -525,8 +555,13 @@ class Class extends UserType {
}
/**
* Holds if this class has a private class derivation, for example the
* "private B" in "class D : private B { ... };".
* Holds if this class/struct has a private class derivation, for
* example the `private B` in the following code:
* ```
* class D : private B {
* ...
* };
* ```
*/
predicate hasPrivateBaseClass(Class base) {
exists(ClassDerivation cd |
@ -537,8 +572,13 @@ class Class extends UserType {
}
/**
* Holds if this class has a public class derivation, for example the
* "public B" in "class D : public B { ... };".
* Holds if this class/struct has a public class derivation, for
* example the `public B` in the following code:
* ```
* class D : public B {
* ...
* };
* ```
*/
predicate hasPublicBaseClass(Class base) {
exists(ClassDerivation cd |
@ -549,8 +589,13 @@ class Class extends UserType {
}
/**
* Holds if this class has a protected class derivation, for example the
* "protected B" in "class D : protected B { ... };".
* Holds if this class/struct has a protected class derivation, for
* example the `protected B` in the following code:
* ```
* class D : protected B {
* ...
* };
* ```
*/
predicate hasProtectedBaseClass(Class base) {
exists(ClassDerivation cd |
@ -560,10 +605,10 @@ class Class extends UserType {
)
}
/** Gets the metric class. */
/** Gets the metric class associated with this class, struct or union. */
MetricClass getMetrics() { result = this }
/** Gets a friend declaration in this class. */
/** Gets a friend declaration in this class, struct or union. */
FriendDecl getAFriendDecl() { result.getDeclaringClass() = this }
override string explain() { result = "class " + this.getName() }
@ -571,15 +616,15 @@ class Class extends UserType {
override predicate isDeeplyConstBelow() { any() } // No subparts
/**
* The alignment of this type in bytes (on the machine where facts were
* Gets the alignment of this type in bytes (on the machine where facts were
* extracted).
*/
override int getAlignment() { usertypesize(underlyingElement(this),_,result) }
/**
* Holds if this class is constructed from another class as a result of
* template instantiation. It originates either from a class template or
* from a class nested in a class template.
* Holds if this class, struct or union is constructed from another class as
* a result of template instantiation. It originates either from a class
* template or from a class nested in a class template.
*/
predicate isConstructedFrom(Class c) {
class_instantiation(underlyingElement(this), unresolveElement(c))
@ -595,7 +640,7 @@ class Class extends UserType {
}
/**
* Holds if or not this class is polymorphic (has a virtual function, or
* Holds if this class/struct is polymorphic (has a virtual function, or
* inherits one).
*/
predicate isPolymorphic() {
@ -606,19 +651,19 @@ class Class extends UserType {
getATemplateArgument().involvesTemplateParameter()
}
/** Holds if this class was declared 'final'. */
/** Holds if this class, struct or union was declared 'final'. */
predicate isFinal() {
usertype_final(underlyingElement(this))
}
/** Gets a link target which references this class. */
/** Gets a link target which references this class, struct or union. */
LinkTarget getALinkTarget() {
this = result.getAClass()
}
/**
* Gets the UUID that associated with this class via the `__declspec(uuid)`
* attribute.
* Gets the UUID that associated with this class, struct or union via the
* `__declspec(uuid)` attribute.
*
* Regardless of the format of the UUID string in source code, the returned
* value is normalized to the standard "registry format", without braces, and
@ -732,18 +777,27 @@ class Class extends UserType {
}
/**
* A class derivation, for example the "public B" in
* "class D : public B { ... };".
* A class derivation, for example the `public B` in the following code:
* ```
* class D : public B {
* ...
* };
* ```
*/
class ClassDerivation extends Locatable, @derivation {
/**
* Gets the class/struct from which we are actually deriving, resolving a
* typedef if necessary. For example, the base class in the following
* would be B:
* typedef if necessary. For example, the base class in the following code
* would be `B`:
* ```
* struct B {
* };
*
* struct B {};
* typedef B T;
* struct D : T {};
*
* struct D : T {
* };
* ```
*/
Class getBaseClass() {
result = getBaseType().getUnderlyingType()
@ -751,22 +805,31 @@ class ClassDerivation extends Locatable, @derivation {
/**
* Gets the type from which we are deriving, without resolving any
* typedef. For example, the base type in the following would be T:
* typedef. For example, the base type in the following code would be `T`:
* ```
* struct B {
* };
*
* struct B {};
* typedef B T;
* struct D : T {};
*
* struct D : T {
* };
* ```
*/
Type getBaseType() {
derivations(underlyingElement(this),_,_,unresolveElement(result),_)
}
/**
* Gets the class that is doing the deriving. For example, the derived
* class in the following would be D:
* Gets the class/struct that is doing the deriving. For example, the derived
* class in the following code would be `D`:
* ```
* struct B {
* };
*
* struct B {};
* struct D : B {};
* struct D : B {
* };
* ```
*/
Class getDerivedClass() {
derivations(underlyingElement(this),unresolveElement(result),_,_,_)
@ -774,14 +837,19 @@ class ClassDerivation extends Locatable, @derivation {
/**
* Gets the index of the derivation in the derivation list for the
* derived class (indexed from 0). For example, the index of the
* derivation of B2 in "struct D : B1, B2 { ... };" would be 1.
* derived class/struct (indexed from 0). For example, the index of the
* derivation of `B2` in the following code would be `1`:
* ```
* struct D : B1, B2 {
* ...
* };
* ```
*/
int getIndex() {
derivations(underlyingElement(this),_,result,_,_)
}
/** Gets a specifier (for example "public") applied to the derivation. */
/** Gets a specifier (for example `public`) applied to the derivation. */
Specifier getASpecifier() {
derspecifiers(underlyingElement(this),unresolveElement(result))
}
@ -818,7 +886,15 @@ class ClassDerivation extends Locatable, @derivation {
}
}
/** A class that is directly enclosed by a function. */
/**
* A class, struct or union that is directly enclosed by a function. For example
* the `struct` in the following code is a `LocalClass`:
* ```
* void myFunction() {
* struct { int x; int y; } vec = { 1, 2 };
* };
* ```
*/
class LocalClass extends Class {
LocalClass() {
isLocal()
@ -833,7 +909,17 @@ class LocalClass extends Class {
}
/**
* A nested class [4140 9.7].
* A class, struct or union that is declared within another class. For example
* the struct `PairT` in the following code is a nested class:
* ```
* template<class T>
* class MyTemplateClass {
* public:
* struct PairT {
* T first, second;
* };
* };
* ```
*/
class NestedClass extends Class {
NestedClass() {
@ -855,7 +941,7 @@ class NestedClass extends Class {
}
/**
* An "abstract class", in other words a class that contains at least one
* An "abstract class", in other words a class/struct that contains at least one
* pure virtual function.
*/
class AbstractClass extends Class {
@ -867,8 +953,18 @@ class AbstractClass extends Class {
}
/**
* A class template. (This class also finds partial specializations
* of class templates).
* A class template (this class also finds partial specializations
* of class templates). For example in the following code there is a
* `MyTemplateClass<T>` template:
* ```
* template<class T>
* class MyTemplateClass {
* ...
* };
* ```
* Note that this does not include template instantiations, and full
* specializations. See `ClassTemplateInstantiation` and
* `FullClassTemplateSpecialization`.
*/
class TemplateClass extends Class {
TemplateClass() { usertypes(underlyingElement(this),_,6) }
@ -881,7 +977,17 @@ class TemplateClass extends Class {
}
/**
* A class that is an instantiation of a template.
* A class that is an instantiation of a template. For example in the following
* code there is a `MyTemplateClass<int>` instantiation:
* ```
* template<class T>
* class MyTemplateClass {
* ...
* };
*
* MyTemplateClass<int> instance;
* ```
* For the `MyTemplateClass` template itself, see `TemplateClass`.
*/
class ClassTemplateInstantiation extends Class {
TemplateClass tc;
@ -895,7 +1001,16 @@ class ClassTemplateInstantiation extends Class {
/**
* Gets the class template from which this instantiation was instantiated.
*
* Example: For `std::vector<float>`, returns `std::vector<T>`.
* For example for `MyTemplateClass<int>` in the following code, the result is
* `MyTemplateClass<T>`:
* ```
* template<class T>
* class MyTemplateClass {
* ...
* };
*
* MyTemplateClass<int> instance;
* ```
*/
TemplateClass getTemplate() {
result = tc
@ -903,12 +1018,14 @@ class ClassTemplateInstantiation extends Class {
}
/**
* A specialization of a class template.
* A specialization of a class template (this may be a full or partial template
* specialization - see `FullClassTemplateSpecialization` and
* `PartialClassTemplateSpecialization`).
*/
abstract class ClassTemplateSpecialization extends Class {
/**
* Gets the primary template for the specialization, for example
* S&lt;T,int> -> S&lt;T,U>.
* Gets the primary template for the specialization, for example on
* `S<T,int>`, the result is `S<T,U>`.
*/
TemplateClass getPrimaryTemplate() {
// Ignoring template arguments, the primary template has the same name
@ -928,7 +1045,19 @@ abstract class ClassTemplateSpecialization extends Class {
}
/**
* A full specialization of a class template.
* A full specialization of a class template. For example `MyTemplateClass<int>`
* in the following code is a `FullClassTemplateSpecialization`:
* ```
* template<class T>
* class MyTemplateClass {
* ...
* };
*
* template<>
* class MyTemplateClass<int> {
* ...
* };
* ```
*/
class FullClassTemplateSpecialization extends ClassTemplateSpecialization {
FullClassTemplateSpecialization() {
@ -947,7 +1076,19 @@ class FullClassTemplateSpecialization extends ClassTemplateSpecialization {
}
/**
* A partial specialization of a class template.
* A partial specialization of a class template. For example `MyTemplateClass<int, T>`
* in the following code is a `PartialClassTemplateSpecialization`:
* ```
* template<class S, class T>
* class MyTemplateClass {
* ...
* };
*
* template<class T>
* class MyTemplateClass<int, T> {
* ...
* };
* ```
*/
class PartialClassTemplateSpecialization extends ClassTemplateSpecialization {
PartialClassTemplateSpecialization() {
@ -973,10 +1114,19 @@ class PartialClassTemplateSpecialization extends ClassTemplateSpecialization {
}
/**
* An "interface", in other words a class that only contains pure virtual
* functions.
* An "interface" is a class that only contains pure virtual functions (and contains
* at least one such function). For example:
* ```
* class MyInterfaceClass {
* public:
* virtual void myMethod1() = 0;
* virtual void myMethod2() = 0;
* };
* ```
*
* DEPRECATED: This class is considered to be too specific for general usage.
*/
class Interface extends Class {
deprecated class Interface extends Class {
Interface() {
forex(Declaration m | m.getDeclaringType() = this.getABaseClass*() and not compgenerated(unresolveElement(m)) | m instanceof PureVirtualFunction)
}
@ -985,8 +1135,13 @@ class Interface extends Class {
}
/**
* A class derivation that is virtual, for example
* "class X : --> virtual public Y &lt;--."
* A class/struct derivation that is virtual. For example the derivation in
* the following code is a `VirtualClassDerivation`:
* ```
* class MyClass : public virtual MyBaseClass {
* ...
* };
* ```
*/
class VirtualClassDerivation extends ClassDerivation {
VirtualClassDerivation() {
@ -997,7 +1152,18 @@ class VirtualClassDerivation extends ClassDerivation {
}
/**
* A class that is the base of some virtual class derivation.
* A class/struct that is the base of some virtual class derivation. For
* example `MyBaseClass` in the following code is a `VirtualBaseClass` of
* `MyClass`:
* ```
* class MyBaseClass {
* ...
* };
*
* class MyClass : public virtual MyBaseClass {
* ...
* };
* ```
*/
class VirtualBaseClass extends Class {
VirtualBaseClass() {
@ -1006,12 +1172,12 @@ class VirtualBaseClass extends Class {
override string getCanonicalQLClass() { result = "VirtualBaseClass" }
/** A virtual class derivation of which this class is the base. */
/** A virtual class derivation of which this class/struct is the base. */
VirtualClassDerivation getAVirtualDerivation() {
result.getBaseClass() = this
}
/** A class that is derived from this one using virtual inheritance. */
/** A class/struct that is derived from this one using virtual inheritance. */
Class getAVirtuallyDerivedClass() {
result = getAVirtualDerivation().getDerivedClass()
}
@ -1020,10 +1186,12 @@ class VirtualBaseClass extends Class {
/**
* The proxy class (where needed) associated with a template parameter, as
* in the following code:
*
* template &lt;typename T>
* struct S : T // the type of this T is a proxy class
* {};
* ```
* template <typename T>
* struct S : T { // the type of this T is a proxy class
* ...
* };
* ```
*/
class ProxyClass extends UserType {
ProxyClass() {

1
cpp/ql/test/library-tests/virtual_functions/virtual_functions/interfaces.expected
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@ -1 +0,0 @@
| virtual_functions.cpp:1:7:1:7 | A |

4
cpp/ql/test/library-tests/virtual_functions/virtual_functions/interfaces.ql
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@ -1,4 +0,0 @@
import cpp
from Interface i
select i