From 11dc485c8846cc9b06d243109a9257577e68e401 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 21 Mar 2022 10:44:44 +1000
Subject: [PATCH] cmdopt2/args: create a `parseable` trait

---
 cmdopt2/args.hpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/cmdopt2/args.hpp b/cmdopt2/args.hpp
index 65db7414..c9fa76ef 100644
--- a/cmdopt2/args.hpp
+++ b/cmdopt2/args.hpp
@@ -29,6 +29,10 @@ namespace cruft::cmdopt2 {
     };
 
 
+    template <typename T>
+    concept parseable = std::is_arithmetic_v<T>;
+
+
     template <typename BaseT>
     struct ops_t : argument_t {
         template <typename ValueT>
@@ -39,7 +43,7 @@ namespace cruft::cmdopt2 {
         bind (ValueT &ref)
         {
             CHECK (!acceptor1);
-            if constexpr (cruft::concepts::stringy<ValueT>) {
+            if constexpr (parseable<ValueT>) {
                 acceptor1 = [&ref] (std::string_view str) { ref = str; };
             } else {
                 acceptor1 = [&ref] (std::string_view str) { ref = parse::from_string<ValueT> (str); };
@@ -53,7 +57,7 @@ namespace cruft::cmdopt2 {
         {
             CHECK (!acceptor1);
 
-            if constexpr (std::is_same_v<ValueT, std::string>) {
+            if constexpr (parseable<ValueT>) {
                 acceptor1 = [&ref] (std::string_view str) { ref = str; };
             } else {
                 acceptor1 = [&ref] (std::string_view str) { ref = parse::from_string<ValueT> (str); };