88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
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// Ceres Solver - A fast non-linear least squares minimizer
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// Copyright 2012 Google Inc. All rights reserved.
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// http://code.google.com/p/ceres-solver/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: keir@google.com (Keir Mierle)
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//
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// Portable floating point classification. The names are picked such that they
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// do not collide with macros. For example, "isnan" in C99 is a macro and hence
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// does not respect namespaces.
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//
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// TODO(keir): Finish porting!
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#ifndef CERES_PUBLIC_FPCLASSIFY_H_
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#define CERES_PUBLIC_FPCLASSIFY_H_
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#if defined(_MSC_VER)
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#include <float.h>
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#endif
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#include <limits>
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namespace ceres {
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#if defined(_MSC_VER)
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inline bool IsFinite (double x) { return _finite(x) != 0; }
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inline bool IsInfinite(double x) { return _finite(x) == 0 && _isnan(x) == 0; }
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inline bool IsNaN (double x) { return _isnan(x) != 0; }
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inline bool IsNormal (double x) {
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int classification = _fpclass(x);
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return classification == _FPCLASS_NN ||
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classification == _FPCLASS_PN;
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}
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#elif defined(ANDROID) && defined(_STLPORT_VERSION)
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// On Android, when using the STLPort, the C++ isnan and isnormal functions
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// are defined as macros.
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inline bool IsNaN (double x) { return isnan(x); }
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inline bool IsNormal (double x) { return isnormal(x); }
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// On Android NDK r6, when using STLPort, the isinf and isfinite functions are
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// not available, so reimplement them.
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inline bool IsInfinite(double x) {
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return x == std::numeric_limits<double>::infinity() ||
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x == -std::numeric_limits<double>::infinity();
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}
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inline bool IsFinite(double x) {
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return !isnan(x) && !IsInfinite(x);
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}
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# else
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// These definitions are for the normal Unix suspects.
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inline bool IsFinite (double x) { return std::isfinite(x); }
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inline bool IsInfinite(double x) { return std::isinf(x); }
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inline bool IsNaN (double x) { return std::isnan(x); }
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inline bool IsNormal (double x) { return std::isnormal(x); }
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#endif
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} // namespace ceres
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#endif // CERES_PUBLIC_FPCLASSIFY_H_
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