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