How to Access Raw Vector Data for Processing in C ?

Access Raw Vector Data for Processing in C

This inquiry pertains to utilizing a std::vector as a char array for a function that accepts a void pointer as its argument:

void process_data(const void *data);

Previous attempts to pass character arrays as arguments have been successful. However, the need for dynamic handling has prompted the exploration of using std::vector.

Attempts to pass the vector directly or through its begin iterator have not yielded the desired results, prompting the question of how to access the raw vector data for processing.

Solution

To pass the vector's data to the function, obtain the address of the initial element using one of the following methods:

• &something[0] or &something.front(): Address of the first element.
• &*something.begin(): Address of the element pointed by the begin iterator.
• &something.data(): Safe to use even if the vector is empty (available in C 11 onwards).

Example:

// Assuming something is a std::vector<char>
process_data(&something[0]);

This method ensures access to the raw vector data regardless of the data format (floats, etc.).

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