Input range front property.
The caller must make sure that there is actually still an element available before invoking this property, either by evaluating empty, or by external knowledge. Failing to do so will result in an abnormal program termination.
See Implementation
Input range front property.
The caller must make sure that there is actually still an element available before invoking this property, either by evaluating empty, or by external knowledge. Failing to do so will result in an abnormal program termination.