protobuf/third_party/benchmark/src/complexity.h

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// Copyright 2016 Ismael Jimenez Martinez. All rights reserved.
//
// 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
//
//     http://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.
 
// Source project : https://github.com/ismaelJimenez/cpp.leastsq
// Adapted to be used with google benchmark
 
#ifndef COMPLEXITY_H_
#define COMPLEXITY_H_
 
#include <string>
#include <vector>
 
#include "benchmark/benchmark.h"
 
namespace benchmark {
 
// Return a vector containing the mean and standard devation information for
// the specified list of reports. If 'reports' contains less than two
// non-errored runs an empty vector is returned
std::vector<BenchmarkReporter::Run> ComputeStats(
    const std::vector<BenchmarkReporter::Run>& reports);
 
// Return a vector containing the bigO and RMS information for the specified
// list of reports. If 'reports.size() < 2' an empty vector is returned.
std::vector<BenchmarkReporter::Run> ComputeBigO(
    const std::vector<BenchmarkReporter::Run>& reports);
 
// This data structure will contain the result returned by MinimalLeastSq
//   - coef        : Estimated coeficient for the high-order term as
//                   interpolated from data.
//   - rms         : Normalized Root Mean Squared Error.
//   - complexity  : Scalability form (e.g. oN, oNLogN). In case a scalability
//                   form has been provided to MinimalLeastSq this will return
//                   the same value. In case BigO::oAuto has been selected, this
//                   parameter will return the best fitting curve detected.
 
struct LeastSq {
  LeastSq() : coef(0.0), rms(0.0), complexity(oNone) {}
 
  double coef;
  double rms;
  BigO complexity;
};
 
// Function to return an string for the calculated complexity
std::string GetBigOString(BigO complexity);
 
}  // end namespace benchmark
#endif  // COMPLEXITY_H_