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// Copyright 2017 The Effcee Authors.
//
// 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 EFFCEE_DIAGNOSTIC_H
#define EFFCEE_DIAGNOSTIC_H
#include <sstream>
#include "effcee/effcee.h"
namespace effcee {
// A Diagnostic contains a Result::Status value and can accumulate message
// values via operator<<. It is convertible to a Result object containing the
// status and the stringified message.
class Diagnostic {
public:
explicit Diagnostic(Result::Status status) : status_(status) {}
// Copy constructor.
Diagnostic(const Diagnostic& other) : status_(other.status_), message_() {
// We can't move an ostringstream. As a fallback, we'd like to use the
// std::ostringstream(std::string init_string) constructor. However, that
// initial string disappears inexplicably the first time we shift onto
// the |message_| member. So fall back further and use the default
// constructor and later use an explicit shift.
message_ << other.message_.str();
}
// Appends the given value to the accumulated message.
template <typename T>
Diagnostic& operator<<(const T& value) {
message_ << value;
return *this;
}
// Converts this object to a result value containing the stored status and a
// stringified copy of the message.
operator Result() const { return Result(status_, message_.str()); }
private:
Result::Status status_;
std::ostringstream message_;
};
} // namespace effcee
#endif
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