add std::string to number funtion

include/toolkit.h

@@ -3,6 +3,8 @@
 
 #include <charconv>
 #include <expected>
+#include <type_traits>
+#include <string_view>
 
 //use for to_chars
 constexpr size_t buffer_size = 32;
@@ -18,6 +20,18 @@ namespace toolkit{
         }
         return std::string(buffer, res.ptr - buffer);
     }
+    
+    template<typename T = double>// requires std::is_same_v<T, std::string>
+    std::expected<T, std::string> stoi(const std::string& str){
+        T value;
+        
+        auto res = std::from_chars(str.c_str(), str.c_str() + str.size(), value);
+        if(res.ec != std::errc()){
+            return std::unexpected(std::make_error_code(res.ec).message());
+        }
+        return value;
+        
+    }
 }
 
 #endif

src/main.cpp

@@ -4,8 +4,8 @@ using namespace std;
 
 int main(int argc, char** argv)
 {
-    double num = .2;
+	std::string num = "2";
-    auto str = toolkit::itos(num);
+    auto str = toolkit::stoi(num);
-    cout<<str.value()<<"\n";
+    cout<<*str<<"\n";
     return 0;
 }

xmake.lua

@@ -1,4 +1,4 @@
-set_languages("C++23")
+set_languages("c++23")
 add_includedirs("include/")
 add_rules("mode.debug", "mode.release")