pow10_helper.h
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1 //
2 // Copyright 2018 The Abseil Authors.
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 // https://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 // This test helper library contains a table of powers of 10, to guarantee
17 // precise values are computed across the full range of doubles. We can't rely
18 // on the pow() function, because not all standard libraries ship a version
19 // that is precise.
20 #ifndef ABSL_STRINGS_INTERNAL_POW10_HELPER_H_
21 #define ABSL_STRINGS_INTERNAL_POW10_HELPER_H_
22 
23 #include <vector>
24 
25 namespace absl {
26 namespace strings_internal {
27 
28 // Computes the precise value of 10^exp. (I.e. the nearest representable
29 // double to the exact value, rounding to nearest-even in the (single) case of
30 // being exactly halfway between.)
31 double Pow10(int exp);
32 
33 } // namespace strings_internal
34 } // namespace absl
35 
36 #endif // ABSL_STRINGS_INTERNAL_POW10_HELPER_H_
double Pow10(int exp)
Definition: algorithm.h:29


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autogenerated on Wed Jun 19 2019 19:19:57