I have already seen Is there a one-liner to unpack tuple/pair into references? and know how the unpack values from tuple/pairs in a single line like following
auto [validity, table] = isFieldPresentAndSet(r, "is_federated");
here isFieldPresentAndSet
returns a tuple.
Now I want to reuse these two variable in multiple successive calls of isFieldPresentAndSet
like following
auto [validity, table] = isFieldPresentAndSet(r, "is_federated");
auto [validity, table] = isFieldPresentAndSet(r, "gslb_sp_enabled");
and then check the value for the validity
and table
. But this gives me compile error because I am redefining the validity
and table
variable second time. If the change the second line to
[validity, table] = isFieldPresentAndSet(r, "gslb_sp_enabled");
or
validity, table = isFieldPresentAndSet(r, "gslb_sp_enabled");
It still gives me compile error.
Is there any way to do this??
CodePudding user response:
You can use std::tie
. It returns a tuple of references, which makes the assignement possible:
std::tie(validity, table) = isFieldPresentAndSet(r, "gslb_sp_enabled");