uninstantiation_error/1 — The Logtalk Handbook v3.47.0 documentation

# `uninstantiation_error/1`

## Description

    uninstantiation_error(Culprit)

Throws an uninstantiation error. Used when an argument or one of its sub-arguments is bound but a variable is required. For example, trying to open a file with a stream argument bound.

This built-in method is declared private and thus cannot be used as a message to an object. Calling this predicate is equivalent to the following sequence of calls:

    ...,
    context(Context),
    throw(error(uninstantiation_error(Culprit), Context)).

This allows the user to generate errors in the same format used by the runtime.

## Modes and number of proofs

    uninstantiation_error(@nonvar) - error

## Errors

When called:
`uninstantiation_error(Culprit)`

## Examples

    ...,
    var(Handler),
    uninstantiation_error(my_stream).

See also

catch/3, throw/1, context/1, instantiation_error/0, type_error/2, domain_error/2, existence_error/2, permission_error/3, representation_error/1, evaluation_error/1, resource_error/1, syntax_error/1, system_error/0