init

Telegram/ThirdParty/range-v3/cmake/concepts_test_code.cpp

@@ -0,0 +1,29 @@
+#if !defined(__cpp_concepts) || __cpp_concepts == 0
+#error "Sorry, Charlie. No concepts"
+#else
+#if __cpp_concepts <= 201507L
+#define concept concept bool
+#endif
+
+template<class>
+concept True = true;
+
+template<class T>
+constexpr bool test(T)
+{
+    return false;
+}
+
+template<class T>
+    requires True<T>
+constexpr bool test(T)
+{
+    return true;
+}
+
+int main()
+{
+    static_assert(::test(42), "");
+}
+
+#endif