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include/snipplib/concepts/snplib_concepts.h

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+#pragma once
+
+#include <concepts>
+#include <ranges>
+
+namespace snplib {
+
+// type T is hashable
+template <typename T>
+concept snplib_hashable_c = requires(T t) {
+    { std::hash<T>(t) } -> std::convertible_to<size_t>;
+};
+
+template <typename T, typename CharT = char>
+concept snplib_char_range_c = std::ranges::range<T> && std::same_as<std::ranges::range_value_t<T>, CharT>;
+
+template <typename T, typename CharT = char>
+concept snplib_input_char_range_c = std::ranges::input_range<T> && std::same_as<std::ranges::range_value_t<T>, CharT>;
+
+template <typename T, typename CharT = char>
+concept snplib_output_char_range_c = std::ranges::output_range<T, CharT>;
+
+template <typename T, typename CharT = char>
+concept snplib_char_view_c = std::ranges::view<T> && std::same_as<std::ranges::range_value_t<T>, CharT>;
+
+
+
+} // end of snplib namespace