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Diffstat (limited to 'extern/libmv/third_party/ceres/internal/ceres/array_utils.cc')
-rw-r--r-- | extern/libmv/third_party/ceres/internal/ceres/array_utils.cc | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/extern/libmv/third_party/ceres/internal/ceres/array_utils.cc b/extern/libmv/third_party/ceres/internal/ceres/array_utils.cc new file mode 100644 index 00000000000..673baa4f70f --- /dev/null +++ b/extern/libmv/third_party/ceres/internal/ceres/array_utils.cc @@ -0,0 +1,67 @@ +// Ceres Solver - A fast non-linear least squares minimizer +// Copyright 2012 Google Inc. All rights reserved. +// http://code.google.com/p/ceres-solver/ +// +// 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: sameeragarwal@google.com (Sameer Agarwal) + +#include "ceres/array_utils.h" + +#include <cmath> +#include <cstddef> +#include "ceres/fpclassify.h" + +namespace ceres { +namespace internal { + +// It is a near impossibility that user code generates this exact +// value in normal operation, thus we will use it to fill arrays +// before passing them to user code. If on return an element of the +// array still contains this value, we will assume that the user code +// did not write to that memory location. +const double kImpossibleValue = 1e302; + +bool IsArrayValid(const int size, const double* x) { + if (x != NULL) { + for (int i = 0; i < size; ++i) { + if (!IsFinite(x[i]) || (x[i] == kImpossibleValue)) { + return false; + } + } + } + return true; +} + +void InvalidateArray(const int size, double* x) { + if (x != NULL) { + for (int i = 0; i < size; ++i) { + x[i] = kImpossibleValue; + } + } +} + +} // namespace internal +} // namespace ceres |