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