- removal of basic_fixed_string (it was unused)

- fixed_string calculate capacity without \0 at the end, so the result fixed_string is exactly same as the one build by id<...>
- less template instantiations aroung result.get<...>() functions

Author: Hana Dusíková

include/ctll/fixed_string.hpp

@@ -41,7 +41,7 @@ template <size_t N> struct fixed_string {
 	size_t real_size{0};
 	bool correct_flag{true};
 
-	template <typename T> constexpr fixed_string(const T (&input)[N]) noexcept {
+	template <typename T> constexpr fixed_string(const T (&input)[N+1]) noexcept {
 		if constexpr (std::is_same_v<T, char>) {
 			#if CTRE_STRING_IS_UTF8
 				size_t out{0};
@@ -168,10 +168,13 @@ template <size_t N> struct fixed_string {
 		}
 		return true;
 	}
+	constexpr operator std::basic_string_view<char32_t>() const noexcept {
+		return std::basic_string_view<char32_t>{content, size()};
+	}
 };
 
 template <> class fixed_string<0> {
-	static constexpr char32_t __empty[1] = {0};
+	static constexpr char32_t empty[1] = {0};
 public:
 	template <typename T> constexpr fixed_string(const T *) noexcept {
 
@@ -189,29 +192,28 @@ template <> class fixed_string<0> {
 		return 0;
 	}
 	constexpr const char32_t * begin() const noexcept {
-		return __empty;
+		return empty;
 	}
 	constexpr const char32_t * end() const noexcept {
-		return __empty + size();
+		return empty + size();
 	}
 	constexpr char32_t operator[](size_t) const noexcept {
 		return 0;
 	}
+	constexpr operator std::basic_string_view<char32_t>() const noexcept {
+		return std::basic_string_view<char32_t>{empty, 0};
+	}
 };
 
-template <typename CharT, size_t N> fixed_string(const CharT (&)[N]) -> fixed_string<N>;
+template <typename CharT, size_t N> fixed_string(const CharT (&)[N]) -> fixed_string<N-1>;
 template <size_t N> fixed_string(fixed_string<N>) -> fixed_string<N>;
 
-template <typename T, size_t N> class basic_fixed_string: public fixed_string<N> {
-	using parent = fixed_string<N>;
-public:
-	template <typename... Args> constexpr basic_fixed_string(Args && ... args) noexcept: parent(std::forward<Args>(args)...) { }
-};
-
-template <typename CharT, size_t N> basic_fixed_string(const CharT (&)[N]) -> basic_fixed_string<CharT, N>;
-template <typename CharT, size_t N> basic_fixed_string(basic_fixed_string<CharT, N>) -> basic_fixed_string<CharT, N>;
-
-
 }
 
+#if (__cpp_nontype_template_parameter_class || (__cpp_nontype_template_args >= 201911L))
+	#define CTLL_FIXED_STRING ctll::fixed_string
+#else
+	#define CTLL_FIXED_STRING const auto &
+#endif
+
 #endif