Abseil Common Libraries (C++) (grcp 依赖)
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36 lines
1.3 KiB
36 lines
1.3 KiB
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// Copyright 2018 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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// This test helper library contains a table of powers of 10, to guarantee |
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// precise values are computed across the full range of doubles. We can't rely |
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// on the pow() function, because not all standard libraries ship a version |
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// that is precise. |
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#ifndef ABSL_STRINGS_INTERNAL_POW10_HELPER_H_ |
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#define ABSL_STRINGS_INTERNAL_POW10_HELPER_H_ |
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#include <vector> |
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namespace absl { |
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namespace strings_internal { |
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// Computes the precise value of 10^exp. (I.e. the nearest representable |
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// double to the exact value, rounding to nearest-even in the (single) case of |
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// being exactly halfway between.) |
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double Pow10(int exp); |
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} // namespace strings_internal |
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} // namespace absl |
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#endif // ABSL_STRINGS_INTERNAL_POW10_HELPER_H_
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