i_express

index i_express(...);

is a new index, with data of the types and values described by the every second optional argument in the positions indicated by the preceding optional arguments (data is linked if allowed, copied otherwise)

See Referable Objects.

the function faults if one of the insert positions is repeated.

i_render

index i_render(...);

is a new index, with data of the types and values described by the every second optional argument in the positions indicated by the preceding optional arguments (data is copied)

the function faults if one of the insert positions is repeated.

index

index index(...);

same as ‘i_express’