/* vim: set sw=4 sts=4 et foldmethod=syntax : */ /** \file * * Example \ref example_version_operator.cc "example_version_operator.cc" . * * \ingroup g_names */ /** \example example_version_operator.cc * * This example demonstrates how to use VersionOperator. */ #include <paludis/paludis.hh> #include "example_command_line.hh" #include <iostream> #include <iomanip> #include <cstdlib> #include <set> #include <list> using namespace paludis; using namespace examples; using std::cout; using std::endl; using std::setw; using std::left; using std::boolalpha; int main(int argc, char * argv[]) { try { CommandLine::get_instance()->run(argc, argv, "example_version_operator", "EXAMPLE_VERSION_OPERATOR_OPTIONS", "EXAMPLE_VERSION_OPERATOR_CMDLINE"); /* Make a set of versions. Use user_version_spec_options() for the * options parameter for VersionSpec's constructor for handling any * user-inputted data. */ std::set<VersionSpec> versions; versions.insert(VersionSpec("1.0", user_version_spec_options())); versions.insert(VersionSpec("1.1", user_version_spec_options())); versions.insert(VersionSpec("1.2", user_version_spec_options())); versions.insert(VersionSpec("1.2-r1", user_version_spec_options())); versions.insert(VersionSpec("2.0", user_version_spec_options())); /* And a list of operators */ std::list<VersionOperator> operators; operators.push_back(VersionOperator("=")); operators.push_back(VersionOperator(">=")); operators.push_back(VersionOperator("~")); operators.push_back(VersionOperator("<")); operators.push_back(VersionOperator("~>")); /* Display a header */ cout << " " << left << setw(8) << "LHS" << " | " << left << setw(8) << "RHS"; for (std::list<VersionOperator>::const_iterator o(operators.begin()), o_end(operators.end()) ; o != o_end ; ++o) cout << " | " << setw(8) << *o; cout << endl << std::string(10, '-'); for (unsigned x(0) ; x <= operators.size() ; ++x) cout << "+" << std::string(10, '-'); cout << endl; /* For each pair of versions... */ for (std::set<VersionSpec>::const_iterator v1(versions.begin()), v1_end(versions.end()) ; v1 != v1_end ; ++v1) { for (std::set<VersionSpec>::const_iterator v2(versions.begin()), v2_end(versions.end()) ; v2 != v2_end ; ++v2) { cout << " " << left << setw(8) << *v1 << " | " << left << setw(8) << *v2; /* Apply all of our operators, and show the results */ for (std::list<VersionOperator>::const_iterator o(operators.begin()), o_end(operators.end()) ; o != o_end ; ++o) { /* VersionOperator::as_version_spec_comparator returns a * binary boolean functor. */ cout << " | " << left << setw(8) << boolalpha << (o->as_version_spec_comparator()(*v1, *v2)); } cout << endl; } } } catch (const Exception & e) { /* Paludis exceptions can provide a handy human-readable backtrace and * an explanation message. Where possible, these should be displayed. */ cout << endl; cout << "Unhandled exception:" << endl << " * " << e.backtrace("\n * ") << e.message() << " (" << e.what() << ")" << endl; return EXIT_FAILURE; } catch (const std::exception & e) { cout << endl; cout << "Unhandled exception:" << endl << " * " << e.what() << endl; return EXIT_FAILURE; } catch (...) { cout << endl; cout << "Unhandled exception:" << endl << " * Unknown exception type. Ouch..." << endl; return EXIT_FAILURE; } return EXIT_SUCCESS; }