uart/utils.hpp

#pragma once

// Fix for limits.h not exposing LLONG_MIN, LLONG_MIN, and ULLONG_MAX to C++ context
#ifdef __cplusplus
#define __STDC_VERSION__ 201112L
#endif

#include <limits.h>

namespace uart {
namespace util {

// clang-format off
template <bool Val> struct set_bool { static constexpr auto value = Val; };

struct true_type : set_bool<true> {};
struct false_type : set_bool<false> {};

template <typename...> struct always_false : false_type {};

template <typename... Ts> static constexpr auto always_false_v = always_false<Ts...>::value;

template <typename T> struct is_integral : false_type {};
template <> struct is_integral<bool> : true_type {};
template <> struct is_integral<char> : true_type {};
template <> struct is_integral<signed char> : true_type {};
template <> struct is_integral<unsigned char> : true_type {};
template <> struct is_integral<short> : true_type {};
template <> struct is_integral<int> : true_type {};
template <> struct is_integral<long int> : true_type {};
template <> struct is_integral<long long int> : true_type {};
template <> struct is_integral<unsigned short> : true_type {};
template <> struct is_integral<unsigned int> : true_type {};
template <> struct is_integral<unsigned long int> : true_type {};
template <> struct is_integral<unsigned long long int> : true_type {};

template <typename T> static constexpr auto is_integral_v = is_integral<T>::value;

template <typename T, typename U> struct is_same : false_type {};
template <typename T> struct is_same<T, T> : true_type {};

template <typename T, typename U> static constexpr auto is_same_v = is_same<T, U>::value;

template <typename T>
struct NumericLimits {
	static constexpr T min() { return T(); }
	static constexpr T max() { return T(); }
};

template <>
struct NumericLimits<bool> {
	static constexpr bool min() { return false; }
	static constexpr bool max() { return true; }
};

template <>
struct NumericLimits<char> {
	static constexpr char min() { return CHAR_MIN; }
	static constexpr char max() { return CHAR_MAX; }
};

template <>
struct NumericLimits<signed char> {
	static constexpr signed char min() { return SCHAR_MIN; }
	static constexpr signed char max() { return SCHAR_MAX; }
};

template <>
struct NumericLimits<unsigned char> {
	static constexpr unsigned char min() { return 0; }
	static constexpr unsigned char max() { return UCHAR_MAX; }
};

template <>
struct NumericLimits<short> {
	static constexpr short min() { return SHRT_MIN; }
	static constexpr short max() { return SHRT_MAX; }
};

template <>
struct NumericLimits<int> {
	static constexpr int min() { return INT_MIN; }
	static constexpr int max() { return INT_MAX; }
};

template <>
struct NumericLimits<long> {
	static constexpr long int min() { return LONG_MIN; }
	static constexpr long int max() { return LONG_MAX; }
};

template <>
struct NumericLimits<long long int> {
	static constexpr long long int min() { return LLONG_MIN; }
	static constexpr long long int max() { return LLONG_MAX; }
};

template <>
struct NumericLimits<unsigned short> {
	static constexpr unsigned short min() { return 0; }
	static constexpr unsigned short max() { return USHRT_MAX; }
};

template <>
struct NumericLimits<unsigned int> {
	static constexpr unsigned int min() { return 0; }
	static constexpr unsigned int max() { return UINT_MAX; }
};

template <>
struct NumericLimits<unsigned long int> {
	static constexpr unsigned long int min() { return 0; }
	static constexpr unsigned long int max() { return ULONG_MAX; }
};

template <>
struct NumericLimits<unsigned long long int> {
	static constexpr unsigned long long int min() { return 0; }
	static constexpr unsigned long long int max() { return ULLONG_MAX; }
};

template <>
struct NumericLimits<float> {
	template <typename... Ts> static constexpr float min() { static_assert(always_false_v<Ts...>, "Not implemented"); return 0; }
	template <typename... Ts> static constexpr float max() { static_assert(always_false_v<Ts...>, "Not implemented"); return 0; }
};

template <>
struct NumericLimits<double> {
	template <typename... Ts> static constexpr double min() { static_assert(always_false_v<Ts...>, "Not implemented"); return 0; }
	template <typename... Ts> static constexpr double max() { static_assert(always_false_v<Ts...>, "Not implemented"); return 0; }
};

template <>
struct NumericLimits<long double> {
	template <typename... Ts> static constexpr long double min() { static_assert(always_false_v<Ts...>, "Not implemented"); return 0; }
	template <typename... Ts> static constexpr long double max() { static_assert(always_false_v<Ts...>, "Not implemented"); return 0; }
};
// clang-format on

} // namespace util
} // namespace uart