64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
// 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.
|
|
|
|
#include "ortools/math_opt/cpp/message_callback.h"
|
|
|
|
#include <memory>
|
|
#include <ostream>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "absl/base/thread_annotations.h"
|
|
#include "absl/strings/string_view.h"
|
|
#include "absl/synchronization/mutex.h"
|
|
#include "ortools/base/logging.h"
|
|
#include "ortools/base/source_location.h"
|
|
|
|
namespace operations_research::math_opt {
|
|
namespace {
|
|
|
|
class PrinterMessageCallbackImpl {
|
|
public:
|
|
PrinterMessageCallbackImpl(std::ostream& output_stream,
|
|
const absl::string_view prefix)
|
|
: output_stream_(output_stream), prefix_(prefix) {}
|
|
|
|
void Call(const std::vector<std::string>& messages) {
|
|
const absl::MutexLock lock(&mutex_);
|
|
for (const std::string& message : messages) {
|
|
output_stream_ << prefix_ << message << '\n';
|
|
}
|
|
output_stream_.flush();
|
|
}
|
|
|
|
private:
|
|
absl::Mutex mutex_;
|
|
std::ostream& output_stream_ ABSL_GUARDED_BY(mutex_);
|
|
const std::string prefix_;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
MessageCallback PrinterMessageCallback(std::ostream& output_stream,
|
|
const absl::string_view prefix) {
|
|
// Here we must use an std::shared_ptr since std::function requires that its
|
|
// input is copyable. And PrinterMessageCallbackImpl can't be copyable since
|
|
// it uses an absl::Mutex that is not.
|
|
const auto impl =
|
|
std::make_shared<PrinterMessageCallbackImpl>(output_stream, prefix);
|
|
return
|
|
[=](const std::vector<std::string>& messages) { impl->Call(messages); };
|
|
}
|
|
|
|
} // namespace operations_research::math_opt
|