| // Ceres Solver - A fast non-linear least squares minimizer |
| // Copyright 2026 Google Inc. All rights reserved. |
| // http://ceres-solver.org/ |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // * Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // * Neither the name of Google Inc. nor the names of its contributors may be |
| // used to endorse or promote products derived from this software without |
| // specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| // POSSIBILITY OF SUCH DAMAGE. |
| // |
| // Author: hellston20a@gmail.com (H S Helson Go) |
| |
| #ifndef CERES_PUBLIC_CONSTANTS_H_ |
| #define CERES_PUBLIC_CONSTANTS_H_ |
| |
| // TODO(HSHelson): This header should no longer be necessary once C++20's |
| // <numbers> (e.g. std::numbers::pi_v) becomes usable |
| |
| // The constants are computed using mpmath by the following shell command: |
| // |
| // python3 - <<EOF |
| // from mpmath import mp |
| // mp.dps = 64 |
| // print(mp.pi) |
| // print(mp.sqrt(3)) |
| // EOF |
| namespace ceres::constants { |
| // π |
| template <typename T> |
| inline constexpr T pi_v( |
| 3.141592653589793238462643383279502884197169399375105820974944592L); |
| inline constexpr double pi = pi_v<double>; |
| // √3 |
| template <typename T> |
| inline constexpr T sqrt_3_v( |
| 1.732050807568877293527446341505872366942805253810380628055806979L); |
| inline constexpr double sqrt_3 = sqrt_3_v<double>; |
| } // namespace ceres::constants |
| |
| #endif // CERES_PUBLIC_CONSTANTS_H_ |
