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[parser::params] add overload accepting std::initializer_list #80

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[parser::params] add overload accepting std::initializer_list #80

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5f7e531
[parser::params] add overload accepting std::initializer_list
kedartal May 15, 2023
91cd4ac
[parser::params] conditionally enable std::initializer_list overload …
kedartal May 17, 2023
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24 changes: 24 additions & 0 deletions argh.h
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,14 @@
#include <map>
#include <cassert>

#if __cplusplus >= 201703L && __has_include( <version> )
# include <version> // for library features tests
#endif

#if defined( __cpp_lib_ranges )
# include <ranges>
#endif

namespace argh
{
// Terminology:
Expand Down Expand Up @@ -121,6 +129,9 @@ namespace argh
std::multiset<std::string> const& flags() const { return flags_; }
std::multimap<std::string, std::string> const& params() const { return params_; }
multimap_iteration_wrapper params(std::string const& name) const;
#if defined( __cpp_lib_ranges )
auto params(std::initializer_list<char const* const> init_list) const;
#endif
std::vector<std::string> const& pos_args() const { return pos_args_; }

// begin() and end() for using range-for over positional args.
Expand Down Expand Up @@ -482,4 +493,17 @@ namespace argh
auto trimmed_name = trim_leading_dashes(name);
return multimap_iteration_wrapper(params_.lower_bound(trimmed_name), params_.upper_bound(trimmed_name));
}

//////////////////////////////////////////////////////////////////////////

#if defined( __cpp_lib_ranges )
inline auto parser::params(std::initializer_list<char const* const> init_list) const
{
return std::ranges::subrange( init_list.begin(), init_list.end() ) |
std::views::transform( [ this ]( char const * const name ) -> multimap_iteration_wrapper {
return this->params( std::string( name ) );
} ) |
std::views::join;
}
#endif
}