exists

Indicates whether there is currently an operation context, i.e. if the currently executing code has been called from an operation.

When false, accessing other properties and calling functions in this namespace will result in an exception being thrown. When true, other properties and functions in this namespace can be used safely.

Examples:

function main() {
    print(op_context.exists); // prints false
}

operation main() {
    print(op_context.exists); // prints true
}