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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_BOREALIS_INFRA_DESCRIBED_H_
#define CHROME_BROWSER_ASH_BOREALIS_INFRA_DESCRIBED_H_
#include <string>
// TODO(b/172501195): Make these available outside namespace borealis.
namespace borealis {
// A very common kind of error is a non-user-facing string (i.e. something you
// want to log) and an |E| typed error (like a status enum). |E| should be
// trivially copyable.
template <typename E>
class Described {
public:
// Creates an |error| described by the given |description|.
Described(E error, std::string description)
: error_(error), description_(std::move(description)) {}
E error() const { return error_; }
const std::string& description() const { return description_; }
// Converts a Described error from |E| to |F|, by prepending |prefix| to
// |this|'s description.
template <typename F>
Described<F> Into(F error, std::string prefix) {
return Described<F>(error, prefix + ": " + description());
}
private:
E error_;
std::string description_;
};
} // namespace borealis
#endif // CHROME_BROWSER_ASH_BOREALIS_INFRA_DESCRIBED_H_
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