Function secp256k1zkp::ffi::secp256k1_aggsig_add_signatures_single

pub unsafe extern "C" fn secp256k1_aggsig_add_signatures_single(
    cx: *const Context, 
    ret_sig: *mut Signature, 
    sigs: *const *const c_uchar, 
    num_sigs: size_t, 
    pubnonce_total: *const PublicKey
) -> c_int