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39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
// Copyright 2021 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TIME_TIME_DELTA_FROM_STRING_H_
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#define BASE_TIME_TIME_DELTA_FROM_STRING_H_
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#include "base/base_export.h"
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#include "base/strings/string_piece.h"
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#include "third_party/abseil-cpp/absl/types/optional.h"
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namespace base {
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class TimeDelta;
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// Helper function for TimeDelta.
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// This is not part of TimeDelta to avoid dragging the includes above into
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// base/time/time.h.
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//
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// From Go's doc at https://golang.org/pkg/time/#ParseDuration
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// [ParseDuration] parses a duration string. A duration string is
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// a possibly signed sequence of decimal numbers, each with optional
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// fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m".
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// Valid time units are "ns", "us" "ms", "s", "m", "h".
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//
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// Special values that are allowed without specifying units:
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// "0", "+0", "-0" -> TimeDelta()
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// "inf", "+inf" -> TimeDelta::Max()
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// "-inf" -> TimeDelta::Min()
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// Returns `absl::nullopt` when parsing fails. Numbers larger than 2^63-1
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// will fail parsing. Overflowing `number * unit` will return +/-inf, as
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// appropriate.
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BASE_EXPORT absl::optional<TimeDelta> TimeDeltaFromString(
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StringPiece duration_string);
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} // namespace base
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#endif // BASE_TIME_TIME_DELTA_FROM_STRING_H_
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