__vic/include/__vic/memory.h

// Memory-related utilities
//
// Platform: ISO C++ 98/11
// $Id$
//
// (c) __vic 2019

#ifndef __VIC_MEMORY_H
#define __VIC_MEMORY_H

#include<__vic/defs.h>
#if defined(__VIC_STRICT_RAM_ALIGNMENT__) && !defined(__GNUC__)
#include<cstring>
#endif

namespace __vic {

//----------------------------------------------------------------------------
template<class T>
inline T load_unaligned(const void *p)
{
#ifdef __VIC_STRICT_RAM_ALIGNMENT__
#ifdef __GNUC__
    struct wrapper { T v; } __attribute__((packed));
    return static_cast<const wrapper *>(p)->v;
#else
    T v;
    std::memcpy(&v, p, sizeof v);
    return v;
#endif
#else // unaligned access is OK
    return *static_cast<const T *>(p);
#endif
}
//----------------------------------------------------------------------------
template<class T>
inline void store_unaligned(void *p, T v)
{
#ifdef __VIC_STRICT_RAM_ALIGNMENT__
#ifdef __GNUC__
    struct wrapper { T v; } __attribute__((packed));
    static_cast<wrapper *>(p)->v = v;
#else
    std::memcpy(p, &v, sizeof v);
#endif
#else // unaligned access is OK
    *static_cast<T *>(p) = v;
#endif
}
//----------------------------------------------------------------------------

} // namespace

#endif // header guard