/*
  *  MoMEMta: a modular implementation of the Matrix Element Method
  *  Copyright (C) 2016  Universite catholique de Louvain (UCL), Belgium
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation, either version 3 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <random>
 
 #include <momemta/Utils.h>
 #include <momemta/Math.h>
 
 LorentzVector getRandom4Vector(double maxE, double m/*=0*/) {
     static std::mt19937_64 generator;
     std::uniform_real_distribution<double> dist(-maxE, maxE);
 
     while (true) {
         const double px = dist(generator);
         const double py = dist(generator);
         const double pz = dist(generator);
         const double E = std::sqrt(SQ(m) + SQ(px) + SQ(py) + SQ(pz));
         LorentzVector p4(px, py, pz, E);
         if (E < maxE && p4.M() >= 0) {
             return p4;
         }
     }
 }
 
 #ifdef __GNUG__
 #include <cstdlib>
 #include <cxxabi.h>
 #include <memory>
 
 std::string demangle(const char* name) {
 
     int status = -4; // some arbitrary value to eliminate the compiler warning
 
     std::unique_ptr<char, void (*)(void*)> res{abi::__cxa_demangle(name, NULL, NULL, &status),
                                                std::free};
 
     return (status == 0) ? res.get() : name;
 }
 
 #else
 
 // does nothing if not g++
 std::string demangle(const char* name) { return name; }
 
 #endif