ClickHouse/base/common/types.h

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#pragma once
#include <algorithm>
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#include <cstdint>
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#include <cstdlib>
#include <string>
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#include <type_traits>
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using Int8 = int8_t;
using Int16 = int16_t;
using Int32 = int32_t;
using Int64 = int64_t;
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#if __cplusplus <= 201703L
using char8_t = unsigned char;
#endif
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using UInt8 = char8_t;
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using UInt16 = uint16_t;
using UInt32 = uint32_t;
using UInt64 = uint64_t;
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using String = std::string;
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/// The standard library type traits, such as std::is_arithmetic, with one exception
/// (std::common_type), are "set in stone". Attempting to specialize them causes undefined behavior.
/// So instead of using the std type_traits, we use our own version which allows extension.
template <typename T>
struct is_signed
{
static constexpr bool value = std::is_signed_v<T>;
};
template <typename T>
inline constexpr bool is_signed_v = is_signed<T>::value;
template <typename T>
struct is_unsigned
{
static constexpr bool value = std::is_unsigned_v<T>;
};
template <typename T>
inline constexpr bool is_unsigned_v = is_unsigned<T>::value;
template <typename T>
struct is_integral
{
static constexpr bool value = std::is_integral_v<T>;
};
template <typename T>
inline constexpr bool is_integral_v = is_integral<T>::value;
template <typename T>
struct is_arithmetic
{
static constexpr bool value = std::is_arithmetic_v<T>;
};
template <typename T>
inline constexpr bool is_arithmetic_v = is_arithmetic<T>::value;