P2497R0 Testing for success or failure of <charconv> functions

Author: jwakely

source/support.tex

@@ -735,7 +735,7 @@
 #define @\defnlibxname{cpp_lib_three_way_comparison}@              201907L // also in \libheader{compare}
 #define @\defnlibxname{cpp_lib_to_address}@                        201711L // also in \libheader{memory}
 #define @\defnlibxname{cpp_lib_to_array}@                          201907L // also in \libheader{array}
-#define @\defnlibxname{cpp_lib_to_chars}@                          201611L // also in \libheader{charconv}
+#define @\defnlibxname{cpp_lib_to_chars}@                          202306L // also in \libheader{charconv}
 #define @\defnlibxname{cpp_lib_to_underlying}@                     202102L // also in \libheader{utility}
 #define @\defnlibxname{cpp_lib_transformation_trait_aliases}@      201304L // also in \libheader{type_traits}
 #define @\defnlibxname{cpp_lib_transparent_operators}@             201510L // also in \libheader{memory}, \libheader{functional}

source/utilities.tex

@@ -14201,6 +14201,7 @@
     char* ptr;
     errc ec;
     friend bool operator==(const to_chars_result&, const to_chars_result&) = default;
+    constexpr explicit operator bool() const noexcept { return ec == errc{}; }
   };
 
   constexpr to_chars_result to_chars(char* first, char* last, @\placeholder{integer-type}@ value, int base = 10);
@@ -14220,6 +14221,7 @@
     const char* ptr;
     errc ec;
     friend bool operator==(const from_chars_result&, const from_chars_result&) = default;
+    constexpr explicit operator bool() const noexcept { return ec == errc{}; }
   };
 
   constexpr from_chars_result from_chars(const char* first, const char* last,