Allocates a block of memory from the slice allocator and copies block_size bytes into it from mem_block.
mem_block must be non-null if block_size is non-zero.
Since GLib 2.76 this always uses the system malloc() implementation internally.
the number of bytes to allocate
the memory to copy
a pointer to the allocated memory block, which will be null if and only if mem_size is 0
Allocates a block of memory from the slice allocator and copies block_size bytes into it from mem_block.
mem_block must be non-null if block_size is non-zero.
Since GLib 2.76 this always uses the system malloc() implementation internally.