arrow_operator_proxy.h

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// Copyright 2010-2021 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 OR_TOOLS_MATH_OPT_CPP_ARROW_OPERATOR_PROXY_H_
#define OR_TOOLS_MATH_OPT_CPP_ARROW_OPERATOR_PROXY_H_
 
#include <utility>  // IWYU pragma: keep
 
namespace operations_research {
namespace math_opt {
namespace internal {
 
// Proxy used to implement operator-> on iterators that return temporary
// objects.
//
// The operator-> in C++ is interpreted by a drill-down operation that looks for
// a pointer. It is not possible to return a value. So this class is used as a
// proxy to return a pointer from a value.
template <typename T>
class ArrowOperatorProxy {
 public:
  explicit ArrowOperatorProxy(T value) : value_(std::move(value)) {}
  const T* operator->() const { return &value_; }
 
 private:
  T value_;
};
 
}  // namespace internal
}  // namespace math_opt
}  // namespace operations_research
 
#endif  // OR_TOOLS_MATH_OPT_CPP_ARROW_OPERATOR_PROXY_H_