Initial Course

modules/12_cpp20/include/concepts.hpp

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+#pragma once
+
+#include <algorithm>
+#include <cctype>
+#include <concepts>
+#include <string>
+#include <vector>
+
+namespace cpp20 {
+
+template <std::integral T>
+[[nodiscard]] auto double_value(T value) -> T {
+    (void)value;
+    return T{};
+}
+
+template <std::floating_point T>
+[[nodiscard]] auto clamp01(T value) -> T {
+    (void)value;
+    return T{};
+}
+
+template <typename T>
+concept StringLike = requires(T value) {
+    { value.size() } -> std::convertible_to<std::size_t>;
+    { value.data() } -> std::convertible_to<const char*>;
+};
+
+template <StringLike T>
+[[nodiscard]] auto uppercase_copy(const T& text) -> std::string {
+    (void)text;
+    return {};
+}
+
+[[nodiscard]] auto sum_integral(const std::vector<int>& data) -> int;
+
+}  // namespace cpp20