Better way to read value only if it exists?

[hoytech]

Hi! I'm frequently writing the following bit of code:

uint64_t limit = 10;
if (query.optional<uint64_t>("limit")) query.to(limit, "limit");

Is there a less verbose way? Maybe something like this:

uint64_t limit = 10;
query.to_if_exists(limit, "limit");

Thanks in advance for your advice!

[d-frey]

You can use

const auto limit = query.optional< uint64_t >( "limit" ).value_or( 10 );

See https://en.cppreference.com/w/cpp/utility/optional/value_or

[hoytech]

Ahhh I didn't know about value_or.

That's a good solution -- thank you, I appreciate it!