Abseil Common Libraries (C++) (grcp 依赖)
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37 lines
1.3 KiB
37 lines
1.3 KiB
6 years ago
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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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// http://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_POW10_HELPER_H_
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#define ABSL_STRINGS_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_POW10_HELPER_H_
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