#include "tclap/CmdLine.h" #include <iterator> #include <algorithm> // Define a simple 3D vector type template<typename T, size_t LEN> struct Vect { typedef TCLAP::StringLike ValueCategory; T v[LEN]; // operator= will be used to assign to the vector Vect& operator=(const std::string &str) { std::istringstream iss(str); for (size_t n = 0; n < LEN; n++) { if (!(iss >> v[n])) { std::ostringstream oss; oss << " is not a vector of size " << LEN; throw TCLAP::ArgParseException(str + oss.str()); } } if (!iss.eof()) { std::ostringstream oss; oss << " is not a vector of size " << LEN; throw TCLAP::ArgParseException(str + oss.str()); } return *this; } std::ostream& print(std::ostream &os) const { std::copy(v, v + LEN, std::ostream_iterator<T>(os, " ")); return os; } }; int main(int argc, char *argv[]) { TCLAP::CmdLine cmd("Command description message", ' ', "0.9"); TCLAP::ValueArg< Vect<double, 3> > vec("v", "vect", "vector", true, Vect<double, 3>(), "3D vector", cmd); try { cmd.parse(argc, argv); } catch(std::exception &e) { std::cout << e.what() << std::endl; return EXIT_FAILURE; } vec.getValue().print(std::cout); std::cout << std::endl; }