我在那里尝试了一些东西,但我是一个菜鸟,所以如果有人能解释为什么我有多重定义错误?为什么顺便说一下我有未申报的功能呢?
谢谢!
修改
我尝试减少代码,但我认为我无法进一步减少代码,因此它看起来与此编辑之前的版本非常相似。遗憾。
编辑2:
我尝试了一些东西(单独的struct
和向量的函数声明)但我还有最后一个错误:s
vector.h:
#ifndef VECTOR_H_
# define VECTOR_H_
# include <stdlib.h>
# define DEFAULT_VECTOR_SIZE 2
typedef unsigned char t_byte;
typedef struct s_vector t_vector;
struct s_vector
{
size_t stype;
size_t size;
size_t capacity;
void *data;
};
t_vector *new_vector(size_t);
void delete_vector(t_vector *);
# define VECTOR_GENERATE_STRUCT_TYPE(TYPE) VECTOR_GENERATE_NAME(TYPE, TYPE)
# define VECTOR_GENERATE_STRUCT_NAME(TYPE, NAME) \
typedef struct s_vector_##NAME{ \
size_t size; \
size_t capacity; \
TYPE *data; \
} t_vector_##NAME; \
\
t_vector_##NAME *vector_##NAME_new(); \
void vector_##NAME_delete(t_vector_##NAME *); \
int vector_##NAME_init(t_vector_##NAME *this); \
# define VECTOR_GENERATE_FUNC_TYPE(TYPE) VECTOR_GENERATE_FUNC_NAME(TYPE, NAME)
# define VECTOR_GENERATE_FUNC_NAME(TYPE, NAME) \
t_vector_##NAME *vector_##NAME_new() \
{ \
return ((t_vector_##NAME *)new_vector(sizeof(TYPE))); \
} \
\
void vector_##NAME_delete(t_vector_##NAME *this) \
{ \
delete_vector((t_vector *)this); \
} \
int vector_##NAME_init(t_vector_##NAME *this) \
{ \
return (vector_init((t_vector *)this, sizeof(TYPE))); \
} \
VECTOR_GENERATE_STRUCT_NAME(t_byte, byte)
#endif
vector.c:
#include "vector.h"
VECTOR_GENERATE_FUNC_NAME(t_byte, byte)
int vector_init(t_vector *vector)
{
vector->size = 0;
vector->capacity = DEFAULT_VECTOR_SIZE;
if ((vector->data = malloc(DEFAULT_VECTOR_SIZE)) == NULL)
return (-1);
umemset(vector->data, 0, DEFAULT_VECTOR_SIZE);
return (0);
}
t_vector *new_vector(size_t stype)
{
t_vector *vector;
vector = (t_vector *)malloc(sizeof(t_vector));
if (vector != NULL)
{
vector->size = 0;
vector->capacity = DEFAULT_VECTOR_SIZE;
if ((vector->data = malloc(DEFAULT_VECTOR_SIZE)) == NULL)
{
free(vector);
return (NULL);
}
umemset(vector->data, 0, DEFAULT_VECTOR_SIZE);
}
return (vector);
}
void delete_vector(t_vector *this)
{
if (this->data != NULL)
free(this->data);
free(this);
}
int vector_extend(t_vector *this,
size_t type)
{
void *new;
unsigned int i;
i = 0;
this->capacity = this->size * type;
--this->capacity;
while (i < type)
{
this->capacity |= this->capacity << i;
i *= 2;
}
++this->capacity;
new = malloc(this->capacity * 2);
if (new == NULL)
return (-1);
this->capacity *= 2;
umemcpy(this->data, new, this->size * type);
return (0);
}
void vector_clear(t_vector *this)
{
free(this->data);
this->size = 0;
this->capacity = 0;
this->data = NULL;
}
buffer.h:
#ifndef BUFFER_H_
# define BUFFER_H_
# include <stdlib.h>
# include <unistd.h>
# include "vector.h"
typedef unsigned char t_byte;
# define IN 0
# define OUT 1
VECTOR_GENERATE_NAME(t_byte, byte)
typedef struct s_buffer t_buffer;
struct s_buffer
{
int fd[2];
unsigned int cursor;
t_vector_byte *contents;
};
t_buffer *new_buffer(int, int);
void delete_buffer(t_buffer *);
#endif
buffer_new.c:
#include "buff.h"
t_buffer *new_buffer(int in,
int out)
{
t_buffer *buffer;
buffer = (t_buffer *)malloc(sizeof(t_buffer));
if (buffer != NULL)
{
buffer->fd[IN] = in;
buffer->fd[OUT] = out;
buffer->cursor = 0;
vector_byte_init(buffer->contents);
}
return (buffer);
}
buffer_delete.c:
#include "buff.h"
void delete_buffer(t_buffer *buffer)
{
if (buffer != NULL)
{
free(buffer);
}
}
关于错误:
vector.c: In function ‘vector_init’:
vector.c:11:3: warning: implicit declaration of function ‘umemset’ [-Wimplicit-function-declaration]
umemset(vector->data, 0, DEFAULT_VECTOR_SIZE);
^
vector.c: In function ‘vector_extend’:
vector.c:60:3: warning: implicit declaration of function ‘umemcpy’ [-Wimplicit-function-declaration]
umemcpy(this->data, new, this->size * type);
^
buff_new.c: In function ‘new_buffer’:
buff_new.c:14:7: warning: implicit declaration of function ‘vector_byte_init’ [-Wimplicit-function-declaration]
vector_byte_init(buffer->contents);
^
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../lib/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/ccbJdFjO.o: In function `vector_init':
vector.c:(.text+0xac): undefined reference to `umemset'
/tmp/ccbJdFjO.o: In function `new_vector':
vector.c:(.text+0x13c): undefined reference to `umemset'
/tmp/ccbJdFjO.o: In function `vector_extend':
vector.c:(.text+0x269): undefined reference to `umemcpy'
/tmp/ccdymmO4.o: In function `new_buffer':
buff_new.c:(.text+0x52): undefined reference to `vector_byte_init'
collect2: error: ld returned 1 exit status
buffer.h是唯一包含vector.h的文件,但它包含在其他一些文件中。
我认为这就是全部;我用GCC 4.9编译。 所以,如果有人对我有任何线索,那就太酷了!
答案 0 :(得分:0)
您在头文件中确实有对象 definitions 。这包含在每个实现文件(.c
)中,就像粘贴了相同的文本一样。这导致每个实现文件定义创建的对象=&gt;多个定义。
只需在标题中包含对象声明(每个标题前面都有extern
限定符来表示声明 -only)并将定义放入单个实现文件中(很可能与头文件的基本名称相同。就像你的项目一样。
修改强>
根据错误报告中的名称,问题似乎是由于未发布的buffer.h,但是因为它包含了vector.h,这将导致我上面描述的内容。您应该仔细阅读错误消息并尝试理解它们。
编辑2:
您应该检查宏是否确实扩展了您期望的方式。对于这样的大型宏,最好从小版本开始,逐步详细说明。这样的结构倾向于创造出与预期不同的东西,并且可能会被忽视。