indy-credx 1.1.1

Verifiable credential issuance and presentation for Hyperledger Indy (https://www.hyperledger.org/projects), which provides a distributed-ledger-based foundation for self-sovereign identity (https://sovrin.org).
Documentation 
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macro_rules! check_useful_c_ptr {
    ($e:expr) => {
        if ($e).is_null() {
            return Err(err_msg!("Invalid pointer for result value"));
        }
    };
}