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Implemented templated numeric limits

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This commit is contained in:
BlackMark 2019-08-03 14:54:23 +02:00
parent 7d4eddbd8b
commit 50e01c480d
1 changed files with 105 additions and 0 deletions
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105
utils.hpp
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@ -1,5 +1,12 @@
#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 {
@ -11,5 +18,103 @@ struct always_false {
template <typename... Ts>
static constexpr auto always_false_v = always_false<Ts...>::value;
// clang-format off
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