163 lines
4.1 KiB
C++
163 lines
4.1 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2011 Danny Robson <danny@blubinc.net>
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*/
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#ifndef __TYPES_HPP
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#define __TYPES_HPP
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#include "annotations.hpp"
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#include "debug.hpp"
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#include "enable_if.hpp"
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#include <cstdint>
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#include <string>
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#include <limits>
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#include <memory>
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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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namespace detail {
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template <typename T, typename V>
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T
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_sign_cast (const typename enable_if<sizeof(T) == sizeof(V) &&
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std::is_unsigned<T>::value &&
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std::is_signed<V>::value, V>::type v)
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{
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check_hard (v >= 0);
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return static_cast<T> (v);
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}
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template <typename T, typename V>
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T
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_sign_cast (const typename enable_if<sizeof(T) == sizeof(V) &&
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std::is_signed<T>::value &&
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std::is_unsigned<V>::value, V>::type v)
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{
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check_hard (v < std::numeric_limits<V>::max () / 2);
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return static_cast<T> (v);
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}
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}
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/// Safely cast a numeric type to its (un)signed counterpart, aborting if the
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/// dynamically checked result is not representable. May be optimised out if
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/// NDEBUG is defined.
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template <typename T, typename V>
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T
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sign_cast (const V v)
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{ return detail::_sign_cast<T,V>(v); }
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namespace detail {
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// Same sign, no possibility of truncation with larger target type
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template <typename T, typename V>
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T
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_trunc_cast (const typename enable_if<sizeof (T) >= sizeof (V) &&
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std::is_signed<T>::value == std::is_signed<V>::value, V>::type v)
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{ return v; }
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template <typename T, typename V>
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T
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_trunc_cast (const typename enable_if<sizeof (T) < sizeof (V) &&
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std::is_signed<T>::value == std::is_signed<V>::value, V>::type v) {
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check_hard (v <= std::numeric_limits<T>::max ());
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checK_hard (v >= std::numeric_limits<T>::min ());
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return static_cast<T> (v);
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}
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}
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template <typename T, typename V>
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T
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trunc_cast (V v)
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{ return detail::_trunc_cast<T, V> (v); }
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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) pure;
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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) pure;
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template <typename T, typename ...Args>
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std::unique_ptr<T>
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make_unique (const Args &...args)
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{ return std::unique_ptr<T> (new T (args...)); }
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#endif // __TYPES_HPP
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