//===- TemplateInstCallback.h - Template Instantiation Callback - C++ --===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===---------------------------------------------------------------------===//

//

// This file defines the TemplateInstantiationCallback class, which is the

// base class for callbacks that will be notified at template instantiations.

//

//===---------------------------------------------------------------------===//

#ifndef LLVM_CLANG_SEMA_TEMPLATEINSTCALLBACK_H

#define LLVM_CLANG_SEMA_TEMPLATEINSTCALLBACK_H

#include "clang/Sema/Sema.h"

namespace clang {

/// This is a base class for callbacks that will be notified at every

/// template instantiation.

class TemplateInstantiationCallback {

public:

  virtual ~TemplateInstantiationCallback() = default;

  /// Called before doing AST-parsing.

  virtual void initialize(const Sema &TheSema) = 0;

  /// Called after AST-parsing is completed.

  virtual void finalize(const Sema &TheSema) = 0;

  /// Called when instantiation of a template just began.

  virtual void atTemplateBegin(const Sema &TheSema,

                               const Sema::CodeSynthesisContext &Inst) = 0;

  /// Called when instantiation of a template is just about to end.

  virtual void atTemplateEnd(const Sema &TheSema,

                             const Sema::CodeSynthesisContext &Inst) = 0;

};

template <class TemplateInstantiationCallbackPtrs>

void initialize(TemplateInstantiationCallbackPtrs &Callbacks,

                const Sema &TheSema) {

  for (auto &C : Callbacks) {

    if (C)

      C->initialize(TheSema);

  }

}

template <class TemplateInstantiationCallbackPtrs>

void finalize(TemplateInstantiationCallbackPtrs &Callbacks,

              const Sema &TheSema) {

  for (auto &C : Callbacks) {

    if (C)

      C->finalize(TheSema);

  }

}

template <class TemplateInstantiationCallbackPtrs>

void atTemplateBegin(TemplateInstantiationCallbackPtrs &Callbacks,

                     const Sema &TheSema,

                     const Sema::CodeSynthesisContext &Inst) {

  for (auto &C : Callbacks) {

    if (C)

      C->atTemplateBegin(TheSema, Inst);

  }

}

template <class TemplateInstantiationCallbackPtrs>

void atTemplateEnd(TemplateInstantiationCallbackPtrs &Callbacks,

                   const Sema &TheSema,

                   const Sema::CodeSynthesisContext &Inst) {

  for (auto &C : Callbacks) {

    if (C)

      C->atTemplateEnd(TheSema, Inst);

  }

}

} // namespace clang

#endif