在struct初始化时静态初始化struct内部的数组

I am trying to build a ring buffer by using statically allocated array (requirement, already built dinamical, later decided to go statical). However, I would like to have a generic ring buffer structure that would enable instantiating different sizes of arrays inside of it. I have this structure:

我试图通过使用静态分配的数组(要求,已经建立的dinamical,后来决定去静态)来构建一个环形缓冲区。但是,我希望有一个通用的环形缓冲区结构,可以在其中实例化不同大小的数组。我有这个结构:

typedef struct measurementsRingBuffer
{   
    int maxSize;
    int currentSize;
    double measurementsArray[MEAS_ARRAY_CAPACITY];
} measurementsRingBuffer;

I instantiate the structure by:

我通过以下方式实例化结构:

measurementsRingBuffer buffer = { .maxSize = MEAS_ARRAY_CAPACITY, .currentSize = 0 };

Is there any way I could define array size upon struct instantiation, instead of defining it in structure itself? I does not sound possible, but I will give it a shot.

有没有什么办法可以在结构实例化时定义数组大小,而不是在结构本身中定义它?我听起来不太可能,但我会试一试。

1 个解决方案

#1

You can use a pointer to an array:

您可以使用指向数组的指针:

typedef struct measurementsRingBuffer
{   
    int maxSize;
    int currentSize;
    double* measurementsArray ;
} measurementsRingBuffer;

double small_array[10];
measurementsRingBuffer small = { .maxSize = 10 , .measurementsArray = small_array } ;

or even a compound literal:

甚至是复合文字:

measurementsRingBuffer small = { .maxSize = 10 , .measurementsArray = ( double[10] ){ 0 } } ;

Note that the if compound literal is defined outside of a body of a function, it has static storage duration.

请注意,if复合文字是在函数体外定义的,它具有静态存储持续时间。

#1