runtime/base/type_static_if.h

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ART_RUNTIME_BASE_TYPE_STATIC_IF_H_
#define ART_RUNTIME_BASE_TYPE_STATIC_IF_H_

// A static if which determines whether to return type A or B based on the condition boolean.
template <bool condition, typename A, typename B>
struct TypeStaticIf {
  typedef A type;
};

// Specialization to handle the false case.
template <typename A, typename B>
struct TypeStaticIf<false, A,  B> {
  typedef B type;
};

#endif  // ART_RUNTIME_BASE_TYPE_STATIC_IF_H_