src/win32/ime/ime_scoped_context.h

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#ifndef MOZC_WIN32_IME_IME_SCOPED_CONTEXT_H_
#define MOZC_WIN32_IME_IME_SCOPED_CONTEXT_H_

#include <Windows.h>

#include "base/port.h"
#include "win32/base/immdev.h"

namespace mozc {
namespace win32 {

template <class T>
class ScopedHIMC {
 public:
  explicit ScopedHIMC(HIMC himc) : himc_(nullptr), pointer_(nullptr) {
    pointer_ = static_cast<T*>(::ImmLockIMC(himc));
    if (pointer_ == nullptr) {
      return;
    }
    himc_ = himc;
  }

  ~ScopedHIMC() {
    if (himc_ != nullptr) {
      ::ImmUnlockIMC(himc_);
      himc_ = nullptr;
    }
    pointer_ = nullptr;
  }

  const T *get() const {
    return pointer_;
  }

  T *get() {
    return pointer_;
  }

  const T *operator->() const {
    return pointer_;
  }

  T *operator->() {
    return pointer_;
  }

 private:
  HIMC himc_;
  T *pointer_;
  DISALLOW_COPY_AND_ASSIGN(ScopedHIMC);
};

template <class T>
class ScopedHIMCC {
 public:
  explicit ScopedHIMCC(HIMCC himcc) : himcc_(himcc), pointer_(nullptr) {
    pointer_ = static_cast<T*>(::ImmLockIMCC(himcc_));
    if (pointer_ == nullptr) {
      himcc_ = nullptr;
    }
  }

  ~ScopedHIMCC() {
    if (himcc_ != nullptr) {
      ::ImmUnlockIMCC(himcc_);
    }
    pointer_ = nullptr;
  }

  const T *get() const {
    return pointer_;
  }

  T *get() {
    return pointer_;
  }

  const T *operator->() const {
    return pointer_;
  }

  T *operator->() {
    return pointer_;
  }

 private:
  T *pointer_;
  HIMCC himcc_;
  DISALLOW_COPY_AND_ASSIGN(ScopedHIMCC);
};

}  // namespace mozc
}  // namespace win32

#endif  // MOZC_WIN32_IME_IME_SCOPED_CONTEXT_H_