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/*
* Copyright 2010 University of Helsinki.
*
* This file is part of libgu.
*
* Libgu is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* Libgu is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with libgu. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file
*
* Lightweight tagged data.
*/
#ifndef GU_VARIANT_H_
#define GU_VARIANT_H_
#include <gu/defs.h>
#include <gu/mem.h>
/** @name Variants
* @{
*/
typedef uintptr_t GuVariant;
GU_API_DECL
void* gu_alloc_variant(uint8_t tag,
size_t size, size_t align,
GuVariant* variant_out, GuPool* pool);
GU_API_DECL
GuVariant gu_make_variant(uint8_t tag,
size_t size, size_t align,
const void* init, GuPool* pool);
#define gu_new_variant(tag, type, variant_out, pool) \
((type*)gu_alloc_variant(tag, sizeof(type), \
gu_alignof(type), variant_out, pool))
/**<
* @hideinitializer */
#define gu_new_variant_i(POOL, TAG, T, ...) \
gu_make_variant(TAG, sizeof(T), gu_alignof(T), \
&(T){ __VA_ARGS__ }, POOL)
#define gu_new_flex_variant(tag, type, flex_mem, n_elems, variant_out, pool) \
((type*)gu_alloc_variant(tag, \
GU_FLEX_SIZE(type, flex_mem, n_elems), \
gu_flex_alignof(type), \
variant_out, pool))
/**<
* @hideinitializer */
enum {
GU_VARIANT_NULL = -1
};
GU_API_DECL
int gu_variant_tag(GuVariant variant);
GU_API_DECL
void* gu_variant_data(GuVariant variant);
typedef struct GuVariantInfo GuVariantInfo;
struct GuVariantInfo {
int tag;
void* data;
};
GU_API_DECL GuVariantInfo gu_variant_open(GuVariant variant);
GU_API_DECL GuVariant gu_variant_close(GuVariantInfo info);
/** @} */
static inline void*
gu_variant_to_ptr(GuVariant variant)
{
return (void*) variant;
}
static inline GuVariant
gu_variant_from_ptr(const void* p)
{
return (uintptr_t) p;
}
GU_API_DECL extern const GuVariant gu_null_variant;
static inline bool
gu_variant_is_null(GuVariant v) {
return ((void*)v == NULL);
}
#endif // GU_VARIANT_H_
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