如何模仿C ++＆QUOT;通过引用＆QUOT传递数组（指针）;用C？ [英] How to mimic C++ "pass array(pointer) by reference" in C?

问题描述

很抱歉的神秘称号，我搜索了一个答案，但没能找到。无论如何，我想一个字符数组传递到一个函数和修改数组内的指针。这里是我的意思在C ++的例子：

Sorry for the cryptic title, I've searched for an answer, but couldn't find one. Anyway, I'm trying to pass a char array into a function and modify the pointer inside the array. Here is an example of what I mean in C++:

#include "stdio.h"
#include "string.h"

void fill(char*& destination, const char* const input, int size)
{
    memcpy(destination, input, size);
    destination += size;
}

void inner(const char* const string1, int size1)
{
    const int size2 = 8;
    char string2[size2] = "World!\n";

    char output[20];
    char* outputWriter = output;

    fill(outputWriter, string1, size1);
    fill(outputWriter, string2, size2);

    printf(output);
}

int main()
{
    inner("Hello ", 6); 
}

它输出的Hello World！

这是我尝试在C：

#include "stdio.h"
#include "string.h"

void fill(char** const destination, const char* const input, int size)
{
    memcpy(destination, input, size);
    *destination += size;
}

void inner(const char* const string1, int size1)
{
    const int size2 = 8;
    char string2[size2] = "World!\n";

    char output[20];
    char (*outputWriter)[20] = &output;

    fill((char**)outputWriter, string1, size1);
    fill((char**)outputWriter, string2, size2);

    printf(output);
}

int main()
{
    inner("Hello ", 6); 
}

它输出 _orld！，和铸造是不是很pretty。

Which outputs _orld! , and the casting is not very pretty.

什么是这样的一个指针数组传递给函数，以便能够修改它类似于C ++ code做什么？

What is the correct way to pass such a pointer to an array to a function in order to be able to modify it similar to what the C++ code does?

推荐答案

这是你所追求的：

#include "stdio.h"
#include "string.h"

void fill(char** destination, const char* const input, int size)
{
    memcpy(*destination, input, size);
    *destination += size;
}

void inner(const char* const string1, int size1)
{
    const int size2 = 8;
    char string2[size2] = "World!\n";

    char output[20];
    char* ptr = output;

    fill(&ptr, string1, size1);
    fill(&ptr, string2, size2);

    puts(output);
}

int main()
{
    inner("Hello ", 6);
}

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