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//===--- typedef_in_template.cc - test input file for iwyu ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "tests/cxx/direct.h"
#include "tests/cxx/typedef_in_template-d1.h"
template<class T>
class Container {
public:
// Should not be an iwyu violation for T
typedef T value_type;
// C++11 alias declaration, should not be an iwyu violation for T
using alias_type = T;
// IWYU: Pair is...*typedef_in_template-i1.h
typedef Pair<T,T> pair_type;
};
void Declarations() {
// Just using Container does not need the full type for Class because there
// are only aliases made, which do not require full-uses.
// TODO: But currently this is counted as a full-use because Class is used
// inside a template specialization (of Pair) within the definition of
// Container.
// IWYU: Class is...*typedef_in_template-i1.h
// IWYU: Class needs a declaration
Container<Class> c;
// Full-using any of those aliases *should* require a full use of Class.
// IWYU: Class is...*typedef_in_template-i1.h
// IWYU: Class needs a declaration
Container<Class>::value_type vt;
// IWYU: Class is...*typedef_in_template-i1.h
// IWYU: Class needs a declaration
Container<Class>::pair_type pt;
// IWYU: Class is...*typedef_in_template-i1.h
// IWYU: Class needs a declaration
Container<Class>::alias_type at;
}
// STL containers are often implemented via a complex web of type aliases and
// helper classes. Tracking uses through all these layers can be non-trivial.
// The following are some reduced examples in roughly increasing order of
// complexity which can serve as helpful test cases while debugging such
// issues. They were inspired by libstdc++'s implementation of
// std::unordered_map, but don't directly correspond to it.
// Verify that a full-use of an alias of a template parameter is treated as a
// full-use of that parameter.
template <typename T>
struct UsesAliasedParameter {
using TAlias = T;
TAlias t;
};
// IWYU: IndirectClass is...*indirect.h
// IWYU: IndirectClass needs a declaration
UsesAliasedParameter<IndirectClass> a;
// IWYU: IndirectClass is...*indirect.h
// IWYU: IndirectClass needs a declaration
UsesAliasedParameter<IndirectClass>::TAlias a2;
// Try a more complex example, through an additional layer of indirection.
template <typename T>
struct IndirectlyUsesAliasedParameter {
using TAlias = typename UsesAliasedParameter<T>::TAlias;
TAlias t;
};
// IWYU: IndirectClass is...*indirect.h
// IWYU: IndirectClass needs a declaration
IndirectlyUsesAliasedParameter<IndirectClass> b;
template <typename T>
struct NestedUseOfAliasedParameter {
using UserAlias = UsesAliasedParameter<T>;
UserAlias a;
};
// IWYU: IndirectClass is...*indirect.h
// IWYU: IndirectClass needs a declaration
NestedUseOfAliasedParameter<IndirectClass> c;
/**** IWYU_SUMMARY
tests/cxx/typedef_in_template.cc should add these lines:
#include "tests/cxx/indirect.h"
#include "tests/cxx/typedef_in_template-i1.h"
tests/cxx/typedef_in_template.cc should remove these lines:
- #include "tests/cxx/direct.h" // lines XX-XX
- #include "tests/cxx/typedef_in_template-d1.h" // lines XX-XX
The full include-list for tests/cxx/typedef_in_template.cc:
#include "tests/cxx/indirect.h" // for IndirectClass
#include "tests/cxx/typedef_in_template-i1.h" // for Class, Pair
***** IWYU_SUMMARY */
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