MuParserUtils.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#include "MantidAPI/MuParserUtils.h"
 
#include "MantidKernel/PhysicalConstants.h"
 
#include <gsl/gsl_sf.h>
 
using namespace Mantid::PhysicalConstants;
 
namespace Mantid::API::MuParserUtils {
 
// The constant names below try to follow the naming scheme of the
// scipy.constants Python module.
// In addition to these, muParser defines "_e" for the Euler's number and
// "_pi" for pi.
const std::map<double, std::string> MUPARSER_CONSTANTS = {
    {AtomicMassUnit, "atomic_mass"},
    {BoltzmannConstant, "k"},
    {E_mev_toNeutronWavenumberSq, "meV_squared_wave_number_relationship"},
    {h, "h"},
    {h_bar, "hbar"},
    {g, "g"},
    {meV, "meV"},
    {meVtoKelvin, "meV_kelvin_relationship"},
    {meVtoWavenumber, "meV_wave_number_relationship"},
    {MuonGyromagneticRatio, "muon_gyromagnetic_ratio"},
    {MuonLifetime, "muon_life_time"},
    {N_A, "N_A"},
    {NeutronMass, "m_n"},
    {NeutronMassAMU, "m_n_AMU"},
    {M_PI, "pi"}, // Another pi, without the leading '_'.
    {StandardAtmosphere, "atm"}};
 
void MANTID_API_DLL addDefaultConstants(mu::Parser &parser) {
  for (const auto &constant : MUPARSER_CONSTANTS) {
    parser.DefineConst(constant.second, constant.first);
  }
}
 
using oneVarFun = double (*)(double); // pointer to a function of one variable
const std::map<std::string, oneVarFun> MUPARSER_ONEVAR_FUNCTIONS = {{"erf", gsl_sf_erf}, {"erfc", gsl_sf_erfc}};
 
void MANTID_API_DLL extraOneVarFunctions(mu::Parser &parser) {
  for (const auto &function : MUPARSER_ONEVAR_FUNCTIONS) {
    parser.DefineFun(function.first, function.second);
  }
}
 
} // namespace Mantid::API::MuParserUtils