define_options.cc

Go to the documentation of this file.

 
// goptions
#include "goptions.h"
 
// c++
#include <iostream>
 
using namespace std;
 
GOptions defineOptions() {
    GOptions goptions;
    string   help;
 
    // command line switch
    goptions.defineSwitch("log", "a switch, this is just an example.");
 
    // runno: 12,
    help = "Example: -runno=12\n";
    goptions.defineOption(GVariable("runno", 1, "sets the run number"), help);
 
    // nthreads: 8
    help = "Maximum number of threads to use.\n";
    help += "If the number of cores available ncores is less then nthreads, use ncores instead.\n";
    help += "If not set, use all available threads. 0: use all threads\n";
    help += "Example: -nthreads=12 : . \n";
    goptions.defineOption(GVariable("nthreads", 0, "maximum number of threads to use"), help);
 
    vector<GVariable> gparticle = {
        {"name", goptions::NODFLT, "particle name"},
        {"multiplicity", 1, "number of particles per event"},
        {"p", goptions::NODFLT, "momentum"},
        {"theta", "0*degrees", "polar angle"},
        {"delta_theta", 0, "Particle polar angle range, centered on theta. Default: 0"},
    };
 
    help = "Example to add three particles, one electron and two protons, identical except spread in theta : \n \n";
    help +=
        "-gparticle=\"[{pname: e-, p: 2300, theta: 23.0}, {pname: proton, multiplicity: 2, p: 1200, delta_theta: 10}]\"\n";
    goptions.defineOption("gparticle", "define the generator particle(s)", gparticle, help);
 
    return goptions;
}
 
int main(int argc, char* argv[]) {
    // Construct a parsing instance: this will parse YAML files and command-line arguments immediately.
    auto gopts = std::make_shared<GOptions>(argc, argv, defineOptions());
 
    // Typed access: retrieve a scalar integer option.
    cout << " > Nthreads: " << gopts->getScalarInt("nthreads") << endl;
 
    return EXIT_SUCCESS;
}