"extern template" test case.

extern_template.cc

// extern_template.h, .cc don't correspond to interface/implementation pattern.
// They have the same name so that IWYU prints recommendations for both files.

#include "extern_template.h"
#include "indirect.h"

class IndirectClass;

void foo() {
    ExternTemplateClass<IndirectClass> et;
}

extern_template.h

#include "indirect.h"

class IndirectClass;

template <typename T>
class ExternTemplateClass {
public:
    ~ExternTemplateClass();
};

template <typename T>
ExternTemplateClass<T>::~ExternTemplateClass() {
    T::StaticMethod();
}

extern template class ExternTemplateClass<IndirectClass>;
//template class ExternTemplateClass<IndirectClass>;

indirect.h

//===--- indirect.h - 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.
//
//===----------------------------------------------------------------------===//

// This file is meant to be #included by "direct.h", which is directly
// #included by some .cc file.  It provides an easy-to-access
// definition of a symbol that will cause an iwyu violation in a .cc
// file.

#ifndef DEVTOOLS_MAINTENANCE_INCLUDE_WHAT_YOU_USE_TESTS_INDIRECT_H_
#define DEVTOOLS_MAINTENANCE_INCLUDE_WHAT_YOU_USE_TESTS_INDIRECT_H_

class IndirectClass {
 public:
  void Method() const { };
  int a;
  static void StaticMethod() { };
  static int statica;
};


#endif  // DEVTOOLS_MAINTENANCE_INCLUDE_WHAT_YOU_USE_TESTS_INDIRECT_H_