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Create a new non-modifiable buffer that represents the given POD vector.
template<
    typename PodType,
    typename Allocator>
const_buffer buffer(
    const std::vector< PodType, Allocator > & data,
    std::size_t max_size_in_bytes);
          A const_buffer
          value equivalent to:
        
const_buffer(
    data.size() ? &data[0] : 0,
    min(data.size() * sizeof(PodType), max_size_in_bytes));
The buffer is invalidated by any vector operation that would also invalidate iterators.