Merge pull request #46 from OpenVicProject/fix/char-detection

Add runtime encoding detection and conversion 

1 files changed, 49 insertions, 0 deletions

diff --git a/include/openvic-dataloader/detail/Concepts.hpp b/include/openvic-dataloader/detail/Concepts.hpp
new file mode 100644
index 0000000..79e04a9
--- /dev/null
+++ b/include/openvic-dataloader/detail/Concepts.hpp
@@ -0,0 +1,49 @@
+#pragma once
+
+#include <concepts>
+#include <cstdint>
+#include <functional>
+#include <utility>
+
+namespace ovdl {
+	struct File;
+	namespace detail {
+		enum class buffer_error : std::uint8_t;
+	}
+}
+
+namespace ovdl::detail {
+	template<typename T, typename... Ts>
+	concept any_of = std::disjunction_v<std::is_same<T, Ts>...>;
+
+	template<typename T>
+	concept HasCstr =
+		requires(T t) {
+			{ t.c_str() } -> std::same_as<const char*>;
+		};
+
+	template<typename T>
+	concept HasPath = requires(T& t) {
+		{ t.path() } -> std::same_as<const char*>;
+	};
+
+	template<typename T, typename Self, typename... Args>
+	concept LoadCallback =
+		requires(T&& t, Self&& self, Args&&... args) {
+			{ std::invoke(std::forward<T>(t), std::forward<Self>(self), std::forward<Args>(args)...) } -> std::same_as<ovdl::detail::buffer_error>;
+		};
+
+	template<typename T>
+	concept IsEncoding = requires(T t) {
+		typename T::char_type;
+		typename T::int_type;
+		{ T::template is_secondary_char_type<typename T::char_type>() } -> std::same_as<bool>;
+		{ T::eof() } -> std::same_as<typename T::int_type>;
+		{ T::to_int_type(typename T::char_type {}) } -> std::same_as<typename T::int_type>;
+	};
+
+	template<typename T, typename R, typename... Args>
+	concept Invocable_R = std::invocable<T, Args...> && requires(Args&&... args) {
+		{ invoke(forward<Args>(args)...) } -> std::convertible_to<R>;
+	};
+}
\ No newline at end of file