claim.h

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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

 
#pragma once
#include <stddef.h>
#ifdef __cplusplus
    extern "C" {
#elif __STDC_VERSION__ < 202311L
    #include <stdbool.h>
#endif

struct claim {
    size_t seq;

    size_t len[2];

    char *ptr[2];
};

#define claim_cast(C, T, I) ((T)*)((C)->ptr[I])

static inline bool claim_is_empty(const struct claim *it) {
    return it->len[0] == 0;
}

static inline bool claim_is_split(const struct claim *it) {
    return it->len[1] != 0;
}

static inline size_t claim_len(const struct claim *it) {
    return it->len[0] + it->len[1];
}

static inline void claim_consume(struct claim *it) {
    #ifdef NDEBUG
        // Sufficient to ensure claim_is_empty(it) == true
        it->len[0] = 0;
    #else
        *it = (struct claim){0};
    #endif
}
 
#ifdef __cplusplus
    }
#endif