// Copyright 2018 Google LLC

//

// 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 CC_COLOR_H_

#define CC_COLOR_H_

#include <ostream>

#include "absl/strings/string_view.h"

#include "cc/logging.h"

namespace minigo {

// Color represents the stone color of each point on the board.

// The position code relies on the values of kEmpty, kBlack and kWhite being

// 0, 1, 2 respectively for some of its bit twiddling.

enum class Color {

kEmpty,

kBlack,

kWhite,

};

inline Color OtherColor(Color color) {

MG_CHECK(color == Color::kWhite || color == Color::kBlack);

return color == Color::kWhite ? Color::kBlack : Color::kWhite;

}

// Returns ".", "B" or "W".

absl::string_view ColorToCode(Color color);

std::ostream& operator<<(std::ostream& os, Color color);

} // namespace minigo

#endif // CC_COLOR_H_