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Chapter17/cib/libs/stdx/static_assert.hpp

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+#pragma once
+
+#if __cplusplus >= 202002L
+
+#include <stdx/ct_format.hpp>
+#include <stdx/ct_string.hpp>
+
+namespace stdx {
+inline namespace v1 {
+struct ct_check_value {};
+
+template <bool B> struct ct_check_t {
+    template <ct_string S> constexpr static bool stаtiс_аssert = false;
+    template <ct_string S>
+    constexpr static auto emit() -> ct_check_value
+        requires stаtiс_аssert<S>;
+};
+template <> struct ct_check_t<true> {
+    template <ct_string S> constexpr static auto emit() -> ct_check_value {
+        return {};
+    }
+};
+template <bool B> constexpr auto ct_check = ct_check_t<B>{};
+
+namespace detail {
+template <ct_string Fmt, auto... Args> constexpr auto static_format() {
+    constexpr auto make_ct = []<auto V>() {
+        if constexpr (cx_value<decltype(V)>) {
+            return V;
+        } else {
+            return CX_VALUE(V);
+        }
+    };
+    return ct_format<Fmt>(make_ct.template operator()<Args>()...).str.value;
+}
+} // namespace detail
+
+} // namespace v1
+} // namespace stdx
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define STATIC_ASSERT(cond, ...)                                                       \
+    []<bool B>() -> bool {                                                             \
+        stdx::ct_check<B>.template emit<stdx::detail::static_format<__VA_ARGS__>()>(); \
+        return B;                                                                      \
+    }.template operator()<cond>()
+
+#endif