libcruft-util/types.hpp

107 lines
2.3 KiB
C++

#ifndef __TYPES_HPP
#define __TYPES_HPP
#include "enable_if.hpp"
#include <cstdint>
#include <string>
#include <limits>
template <int BITS>
struct bits_type;
template <> struct bits_type< 8> {
static const bool has_floating = false;
typedef uint8_t uint;
typedef int8_t sint;
typedef uint8_t floating;
};
template <> struct bits_type<16> {
static const bool has_floating = false;
typedef uint16_t uint;
typedef int16_t sint;
typedef uint16_t floating;
};
template <> struct bits_type<32> {
static const bool has_floating = true;
typedef uint32_t uint;
typedef int32_t sint;
typedef float floating;
};
template <> struct bits_type<64> {
static const bool has_floating = true;
typedef uint64_t uint;
typedef int64_t sint;
typedef double floating;
};
template <typename T>
struct sized_type : public bits_type<sizeof(T) * 8>
{ };
template <typename T>
std::string type_to_string (void);
namespace detail {
template <typename T, typename V>
T
_sign_cast (typename enable_if<sizeof(T) == sizeof(V) &&
std::is_unsigned<T>::value &&
std::is_signed<V>::value, V>::type v)
{
check_hard (v >= 0);
return static_cast<T> (v);
}
template <typename T, typename V>
T
_sign_cast (typename enable_if<sizeof(T) == sizeof(V) &&
std::is_signed<T>::value &&
std::is_unsigned<V>::value, V>::type v)
{
check_hard (v < std::numeric_limits<V>::max () / 2);
return static_cast<T> (v);
}
}
/// Safely cast a numeric type to its (un)signed counterpart, aborting if the
/// dynamically checked result is not representable. May be optimised out if
/// NDEBUG is defined.
template <typename T, typename V>
T
sign_cast (V v)
{ return detail::_sign_cast<T,V>(v); }
/// Returns the number of elements of a statically allocated array
template <typename T, size_t N>
size_t elems(T (&)[N])
{ return N; }
/// Convert a scalar from host byte order to network byte order
template <typename T>
T hton (T);
/// Convert a scalar from network byte order to host byte order
template <typename T>
T ntoh (T);
#endif // __TYPES_HPP