Danny Robson
128d46d9ad
When we used size_t/ssize_t they conflicted with the system's word sized integers. This should work well for all the numeric types we're likely to see.
147 lines
2.9 KiB
C++
147 lines
2.9 KiB
C++
#ifndef __TYPES_HPP
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#define __TYPES_HPP
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#include <cstdint>
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#include <string>
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#include <limits>
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template <int BITS>
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struct bits_type;
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template <> struct bits_type< 8> {
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static const bool has_floating = false;
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typedef uint8_t uint;
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typedef int8_t sint;
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typedef uint8_t floating;
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};
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template <> struct bits_type<16> {
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static const bool has_floating = false;
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typedef uint16_t uint;
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typedef int16_t sint;
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typedef uint16_t floating;
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};
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template <> struct bits_type<32> {
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static const bool has_floating = true;
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typedef uint32_t uint;
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typedef int32_t sint;
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typedef float floating;
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};
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template <> struct bits_type<64> {
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static const bool has_floating = true;
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typedef uint64_t uint;
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typedef int64_t sint;
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typedef double floating;
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};
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template <typename T>
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struct sized_type : public bits_type<sizeof(T) * 8>
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{ };
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template <typename T>
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std::string type_to_string (void);
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template <typename T>
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struct sign_types;
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template <> struct sign_types <int8_t> {
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typedef int8_t with_sign;
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typedef uint8_t without_sign;
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};
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template <> struct sign_types <uint8_t> {
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typedef int8_t with_sign;
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typedef uint8_t without_sign;
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};
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template <> struct sign_types <int16_t> {
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typedef int16_t with_sign;
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typedef uint16_t without_sign;
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};
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template <> struct sign_types <uint16_t> {
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typedef int16_t with_sign;
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typedef uint16_t without_sign;
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};
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template <> struct sign_types <int32_t> {
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typedef int32_t with_sign;
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typedef uint32_t without_sign;
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};
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template <> struct sign_types <uint32_t> {
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typedef int32_t with_sign;
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typedef uint32_t without_sign;
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};
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template <> struct sign_types <int64_t> {
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typedef signed long with_sign;
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typedef unsigned long without_sign;
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};
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template <> struct sign_types <uint64_t> {
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typedef signed long with_sign;
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typedef unsigned long without_sign;
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};
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/// Safely cast a numeric type to its signed comparison, aborting if the
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/// result is not representable.
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template <typename T>
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typename sign_types<T>::with_sign
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sign_cast (const typename sign_types<T>::without_sign v)
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{
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check_hard (v <= std::numeric_limits<typename sign_types<T>::without_sign>::max () >> 1);
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return static_cast <typename sign_types<T>::with_sign> (v);
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}
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/// Safely cast a numeric type to its unsigned comparison, aborting if the
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/// result is not representable.
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template <typename T>
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typename sign_types<T>::without_sign
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sign_cast (const typename sign_types<T>::with_sign v)
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{
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check_hard (v >= 0);
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return static_cast <typename sign_types<T>::without_sign> (v);
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}
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/// Returns the number of elements of a statically allocated array
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template <typename T, size_t N>
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size_t elems(T (&)[N])
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{ return N; }
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/// Convert a scalar from host byte order to network byte order
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template <typename T>
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T hton (T);
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/// Convert a scalar from network byte order to host byte order
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template <typename T>
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T ntoh (T);
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#endif // __TYPES_HPP
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