Command Line Parser for C++17

Integration

git submodule add https://github.com/jermp/cmd_line_parser.git

Example

#include<iostream>#include"../include/parser.hpp"voidconfigure(cmd_line_parser::parser& parser) {    parser.add("perc",// name"A percentage value.",// description"-p",// shorthandtrue,// required argumentfalse// not boolean option (default is false)    );    parser.add("input_filename","An input file name.","-i",true);    parser.add("output_filename",// name"An output file name.",// description"-o",// shorthandfalse,false);    parser.add("num_trials","Number of trials.","-n",false,false);    parser.add("sorted","Sort output.","--sort",false,true// boolean option: a value is not expected after the shorthand    );    parser.add("buffered","Buffer input.","--buffer",false,true);    parser.add("ram","Amount of ram to use.","--ram",false,false);}intmain(int argc,char** argv) {// declare the parser    cmd_line_parser::parserparser(argc, argv);// configure the parserconfigure(parser);// parse command line and return on failurebool success = parser.parse();if (!success)return1;// now get some variablesauto perc = parser.get<float>("perc");// deduced type is floatauto input_filename =// deduced type is std::string        parser.get<std::string>("input_filename");auto sorted_output = parser.get<bool>("sorted");// deduced type is boolauto buffered_input = parser.get<bool>("buffered");// deduced type is boolsize_t ram =999;// some default valueif (parser.parsed("ram")) {        ram = parser.get<size_t>("ram");// deduced type is size_t    }    std::cout <<"perc:" << perc << std::endl;    std::cout <<"input_filename:" << input_filename << std::endl;    std::cout <<"sorted_output:" << sorted_output << std::endl;    std::cout <<"buffered_input:" << buffered_input << std::endl;    std::cout <<"ram:" << ram << std::endl;try {auto val = parser.get<int>("bar");// fail: no name 'bar' was specified        (void)val;// shut up, compiler!    }catch (std::runtime_errorconst& e) {        std::cerr << e.what() << std::endl;return1;    }return0;}

cd srcmkdir -p buildcd buildcmake ..make./example

Interface

/* Constructor.*/parser(int argc,char** argv);/* Parse command line; return false on failure.*/boolparse();/* Print help message.*/voidhelp()const;/* Add an argument with a name, a description, and a shorthand.   Return false if an argument with the same name already exists.   The last two boolean parameters are used to specify if the argument   is to be required and to be considered a boolean argument (no value after   the shorthand).*/booladd(std::stringconst& name, std::stringconst& descr,          std::stringconst& shorthand,bool is_required,bool is_boolean =false);/* Return true is an option with the given name was parsed; false otherwise.*/boolparsed(std::stringconst& name)const;/* Get a variable of type T by name.   It throws an exception if an argument with the specified name   is not found.*/template<typename T>Tget(std::stringconst& name)const;