memset(&m_oldPos,0,sizeof(TvMatch))代码语句含义
时间: 2023-05-26 22:05:27 浏览: 65
)memset() is a C++ function used to initialize a block of memory with a particular value. It fills a block of memory with the given value by changing every byte of memory to that value. The function takes three arguments: a pointer to the memory block to be filled, the value to be set into each byte, and the number of bytes to be filled.
For example, consider the following code:
```
int arr[10];
memset(arr, 0, sizeof(arr));
```
This code sets each element in the `arr` array to zero by filling it with the value `0`. The function `sizeof()` is used to calculate the number of bytes required to hold the array.
In general, `memset()` is used to quickly set large arrays or blocks of memory to a specific value, such as initializing an array of integers to zero, or quickly clearing out a buffer before writing new data to it.