Copy a secp256k1 context object into caller-provided memory.
The caller must provide a pointer to a rewritable contiguous block of memory
of size at least secp256k1_context_preallocated_size(flags) bytes, suitably
aligned to hold an object of any type.
The block of memory is exclusively owned by the created context object during
the lifetime of this context object, see the description of
secp256k1_context_preallocated_create for details.
a newly created context object.
Args: ctx: an existing context to copy.
In: prealloc: a pointer to a rewritable contiguous block of memory of
size at least secp256k1_context_preallocated_size(flags)
bytes, as detailed above.
Copy a secp256k1 context object into caller-provided memory.
The caller must provide a pointer to a rewritable contiguous block of memory of size at least secp256k1_context_preallocated_size(flags) bytes, suitably aligned to hold an object of any type.
The block of memory is exclusively owned by the created context object during the lifetime of this context object, see the description of secp256k1_context_preallocated_create for details.