8bb54b04ef
FYI: find ortools \( -type d -name .git -prune \) -o -type f -print0 | xargs -0 sed -i 's/\(Copyright 2010\)-2018/\1-2021/g'
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
// Copyright 2010-2021 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Utilities to display linear expression in a human-readable way.
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#ifndef OR_TOOLS_LP_DATA_LP_PRINT_UTILS_H_
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#define OR_TOOLS_LP_DATA_LP_PRINT_UTILS_H_
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#include <string>
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#include "absl/strings/str_format.h"
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#include "ortools/base/integral_types.h"
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#include "ortools/lp_data/lp_types.h"
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namespace operations_research {
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namespace glop {
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// Returns a string representing a floating-point number in decimal,
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// with a precision corresponding to the type of the argument.
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inline std::string Stringify(const float a) {
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return absl::StrFormat("%.7g", a);
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}
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inline std::string Stringify(const double a) {
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return absl::StrFormat("%.16g", a);
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}
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inline std::string Stringify(const long double a) {
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return absl::StrFormat("%.19g", a);
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}
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// Returns a string "num/den" representing the rational approximation of x.
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// The absolute difference between the output fraction and the input "x" will
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// not exceed "precision".
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std::string StringifyRational(const double x, const double precision);
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// If fraction is true, returns a string corresponding to the rational
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// approximation or a decimal approximation otherwise. Note that the absolute
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// difference between the output fraction and "x" will never exceed
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// std::numeric_limits<T>::epsilon().
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std::string Stringify(const Fractional x, bool fraction);
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// Pretty prints a monomial a*x using Stringify(x, fraction) to display a,
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// taking care of the sign of x, whether a is 0, 1, -1, integer. Note that the
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// absolute difference between the output fraction and "x" will never exceed
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// std::numeric_limits<T>::epsilon().
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std::string StringifyMonomial(const Fractional a, const std::string& x,
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bool fraction);
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} // namespace glop
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} // namespace operations_research
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#endif // OR_TOOLS_LP_DATA_LP_PRINT_UTILS_H_
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