From 5f7e531ce1d1cd7c5bc49dc9ee060781c22572db Mon Sep 17 00:00:00 2001
From: Tal Kedar <tal.kedar@k2dq.com>
Date: Mon, 15 May 2023 19:41:16 -0400
Subject: [PATCH 1/2] [parser::params] add overload accepting
 std::initializer_list

---
 argh.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/argh.h b/argh.h
index 5c1d1cb..60bed8d 100644
--- a/argh.h
+++ b/argh.h
@@ -8,6 +8,7 @@
 #include <set>
 #include <map>
 #include <cassert>
+#include <ranges>
 
 namespace argh
 {
@@ -121,6 +122,7 @@ 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;
+      auto                                            params(std::initializer_list<char const* const> init_list) const;
       std::vector<std::string>                 const& pos_args() const { return pos_args_; }
 
       // begin() and end() for using range-for over positional args.
@@ -482,4 +484,13 @@ namespace argh
       auto trimmed_name = trim_leading_dashes(name);
       return multimap_iteration_wrapper(params_.lower_bound(trimmed_name), params_.upper_bound(trimmed_name));
    }
+
+   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;
+   }
 }

From 91cd4ac404b2135628f3c548244f4cad9f211c0e Mon Sep 17 00:00:00 2001
From: Tal Kedar <tal.kedar@k2dq.com>
Date: Wed, 17 May 2023 13:16:16 -0400
Subject: [PATCH 2/2] [parser::params] conditionally enable
 std::initializer_list overload by std::ranges avilability

---
 argh.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/argh.h b/argh.h
index 60bed8d..c62b023 100644
--- a/argh.h
+++ b/argh.h
@@ -8,7 +8,14 @@
 #include <set>
 #include <map>
 #include <cassert>
-#include <ranges>
+
+#if __cplusplus >= 201703L && __has_include( <version> )
+#  include <version> // for library features tests
+#endif
+
+#if defined( __cpp_lib_ranges )
+#  include <ranges>
+#endif
 
 namespace argh
 {
@@ -122,7 +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.
@@ -485,6 +494,9 @@ namespace argh
       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() ) |
@@ -493,4 +505,5 @@ namespace argh
          } ) |
          std::views::join;
    }
+#endif
 }