BAN: Implement some numerical limits

BAN/include/BAN/Limits.h

@@ -0,0 +1,71 @@
+#pragma once
+
+#include <BAN/Traits.h>
+
+#include <stdint.h>
+
+namespace BAN
+{
+
+	template<typename T>
+	class numeric_limits
+	{
+	public:
+		numeric_limits() = delete;
+
+		static constexpr T max() requires(is_signed_v<T> && is_integral_v<T>)
+		{
+			if constexpr(sizeof(T) == sizeof(int8_t))
+				return __INT8_MAX__;
+			if constexpr(sizeof(T) == sizeof(int16_t))
+				return __INT16_MAX__;
+			if constexpr(sizeof(T) == sizeof(int32_t))
+				return __INT32_MAX__;
+			if constexpr(sizeof(T) == sizeof(int64_t))
+				return __INT64_MAX__;
+		}
+
+		static constexpr T max() requires(is_unsigned_v<T> && is_integral_v<T>)
+		{
+			if constexpr(sizeof(T) == sizeof(uint8_t))
+				return __UINT8_MAX__;
+			if constexpr(sizeof(T) == sizeof(uint16_t))
+				return __UINT16_MAX__;
+			if constexpr(sizeof(T) == sizeof(uint32_t))
+				return __UINT32_MAX__;
+			if constexpr(sizeof(T) == sizeof(uint64_t))
+				return __UINT64_MAX__;
+		}
+
+		static constexpr T max() requires(is_floating_point_v<T>)
+		{
+			if constexpr(sizeof(T) == sizeof(float))
+				return __FLT_MAX__;
+			if constexpr(sizeof(T) == sizeof(double))
+				return __DBL_MAX__;
+			if constexpr(sizeof(T) == sizeof(long double))
+				return __LDBL_MAX__;
+		}
+
+		static constexpr T infinity() requires(is_floating_point_v<T>)
+		{
+			if constexpr(sizeof(T) == sizeof(float))
+				return __FLT_MAX__;
+			if constexpr(sizeof(T) == sizeof(double))
+				return __DBL_MAX__;
+			if constexpr(sizeof(T) == sizeof(long double))
+				return __LDBL_MAX__;
+		}
+
+		static constexpr T nan() requires(is_floating_point_v<T>)
+		{
+			if constexpr(sizeof(T) == sizeof(float))
+				return __builtin_nanf("");
+			if constexpr(sizeof(T) == sizeof(double))
+				return __builtin_nan("");
+			if constexpr(sizeof(T) == sizeof(long double))
+				return __builtin_nanl("");
+		}
+	};
+
+}