How to cheaply assign C-style array to std::vector?

Question

Currently I do the following:

// float *c_array = new float[1024];

void Foo::foo(float *c_array, size_t c_array_size) {
  //std::vector cpp_arr         


        

Answer 1

Unlikely it's possible - it's quite dangerous, because std::vector doesn't know how the memory was allocated and how it should be freed.

If it's possible, you may replace original allocation with creation of std::vector of correct size. It uses contiguous memory area, so it can replace manually allocated buffer.