pair.h

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/*
 * Copyright (c) 2014 The University of Manchester
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef __PAIR_H__
#define __PAIR_H__
 
#include "stdint.h"
 
typedef uint64_t pair_t;
 
typedef union {
    pair_t pair;
    struct {
    void *lo;
    void *hi;
    };
} pair_union_t;
 
static inline pair_t __pair(
    void *x,
    void *y)
{
    register pair_union_t tmp;
 
    tmp.lo = x;
    tmp.hi = y;
    return tmp.pair;
}
 
static inline void *fst(
    pair_t p)
{
    register pair_union_t tmp;
 
    tmp.pair = p;
    return tmp.lo;
}
 
static inline void *snd(
    pair_t p)
{
    register pair_union_t tmp;
 
    tmp.pair = p;
    return tmp.hi;
}
 
#define pair(x, y)  __pair((void*)(x), (void*)(y))
 
#endif  /*__PAIR_H__*/