result.h

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/*
 * Copyright (c) Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 * You may select, at your option, one of the above-listed licenses.
 */
 
#ifndef RESULT_H
#define RESULT_H
 
#include <stddef.h>
 
typedef enum {
    result_error_ok,                   
    result_error_skip,                 
    result_error_system_error,         
    result_error_compression_error,    
    result_error_decompression_error,  
    result_error_round_trip_error,     
} result_error_t;
 
typedef struct {
    size_t total_size;  
} result_data_t;
 
typedef struct {
    result_error_t internal_error;
    result_data_t internal_data;
} result_t;
 
static result_t result_error(result_error_t error);
static result_t result_data(result_data_t data);
 
static int result_is_error(result_t result);
static int result_is_skip(result_t result);
static result_error_t result_get_error(result_t result);
static result_data_t result_get_data(result_t result);
 
static result_t result_error(result_error_t error) {
    result_t result = {
        .internal_error = error,
    };
    return result;
}
 
static result_t result_data(result_data_t data) {
    result_t result = {
        .internal_error = result_error_ok,
        .internal_data = data,
    };
    return result;
}
 
static int result_is_error(result_t result) {
    return result_get_error(result) != result_error_ok;
}
 
static int result_is_skip(result_t result) {
    return result_get_error(result) == result_error_skip;
}
 
static result_error_t result_get_error(result_t result) {
    return result.internal_error;
}
 
char const* result_get_error_string(result_t result);
 
static result_data_t result_get_data(result_t result) {
    return result.internal_data;
}
 
#endif