AK: Add Integral and FloatingPoint concepts.

Author: https://github.com/asynts
Commit: https://github.com/SerenityOS/serenity/commit/5f7427ba4bf
Pull-request: https://github.com/SerenityOS/serenity/pull/3007
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/nico

AK/Concepts.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/StdLibExtras.h>
+
+namespace AK::Concepts {
+
+// clang-format off
+
+template<typename T>
+concept Integral = IsIntegral<T>::value;
+
+template<typename T>
+concept FloatingPoint = IsFloatingPoint<T>::value;
+
+// clang-format on
+
+}

AK/StdLibExtras.h

@@ -26,6 +26,11 @@
 
 #pragma once
 
+typedef __UINT64_TYPE__ u64;
+typedef __UINT32_TYPE__ u32;
+typedef __UINT16_TYPE__ u16;
+typedef __UINT8_TYPE__ u8;
+
 #define UNUSED_PARAM(x) (void)x
 
 inline constexpr unsigned round_up_to_power_of_two(unsigned value, unsigned power_of_two)
@@ -455,6 +460,36 @@ template<typename Base, typename Derived>
 struct IsBaseOf : public IntegralConstant<bool, __is_base_of(Base, Derived)> {
 };
 
+template<typename T>
+struct __IsIntegral : FalseType {
+};
+template<>
+struct __IsIntegral<u8> : TrueType {
+};
+template<>
+struct __IsIntegral<u16> : TrueType {
+};
+template<>
+struct __IsIntegral<u32> : TrueType {
+};
+template<>
+struct __IsIntegral<u64> : TrueType {
+};
+template<typename T>
+using IsIntegral = __IsIntegral<typename MakeUnsigned<typename RemoveCV<T>::Type>::Type>;
+
+template<typename T>
+struct __IsFloatingPoint : FalseType {
+};
+template<>
+struct __IsFloatingPoint<float> : TrueType {
+};
+template<>
+struct __IsFloatingPoint<double> : TrueType {
+};
+template<typename T>
+using IsFloatingPoint = __IsFloatingPoint<typename RemoveCV<T>::Type>;
+
 template<typename ReferenceType, typename T>
 using CopyConst =
     typename Conditional<IsConst<ReferenceType>::value, typename AddConst<T>::Type, typename RemoveConst<T>::Type>::Type;