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Copies a limited number of bytes from a source buffer to a target buffer.
std::size_t buffer_copy( const mutable_buffer & target, const const_buffer & source, std::size_t max_bytes_to_copy);
A modifiable buffer representing the memory region to which the bytes will be copied.
A non-modifiable buffer representing the memory region from which the bytes will be copied.
The maximum number of bytes to be copied.
The number of bytes copied.
The number of bytes copied is the lesser of:
buffer_size(target)
buffer_size(source)
max_bytes_to_copy