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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Claire Xenia Wolf <claire@yosyshq.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#ifndef RELPTR_H
#define RELPTR_H
#include <cstdint>
#include "nextpnr_assertions.h"
#include "nextpnr_namespaces.h"
NEXTPNR_NAMESPACE_BEGIN
template <typename T> struct RelPtr
{
int32_t offset;
const T *get() const { return reinterpret_cast<const T *>(reinterpret_cast<const char *>(this) + offset); }
const T &operator[](std::size_t index) const { return get()[index]; }
const T &operator*() const { return *(get()); }
const T *operator->() const { return get(); }
RelPtr(const RelPtr &) = delete;
RelPtr &operator=(const RelPtr &) = delete;
};
NPNR_PACKED_STRUCT(template <typename T> struct RelSlice {
int32_t offset;
uint32_t length;
const T *get() const { return reinterpret_cast<const T *>(reinterpret_cast<const char *>(this) + offset); }
const T &operator[](std::size_t index) const
{
NPNR_ASSERT(index < length);
return get()[index];
}
const T *begin() const { return get(); }
const T *end() const { return get() + length; }
size_t size() const { return length; }
ptrdiff_t ssize() const { return length; }
const T &operator*() const { return *(get()); }
const T *operator->() const { return get(); }
RelSlice(const RelSlice &) = delete;
RelSlice &operator=(const RelSlice &) = delete;
});
NEXTPNR_NAMESPACE_END
#endif /* RELPTR_H */
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