[GROOVY-9470] Automatic type casting with switch..case with instanceof

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 3.0.2
• Component/s: Compiler
• Assignee: Unassigned
• Reporter: Marcin Zajaczkowski
• Created: 15/Mar/20 17:07
• Updated: 15/Mar/20 19:27
• Resolved: 15/Mar/20 19:27

Description

It could be useful to have automatic type casting (also with static compilation) with switch..case with instanceof:

void sortItOut(Object o) {

    switch(o) {
      case String:
        println "String: ${o.length()}" //currently only in dynamic Groovy
        break
      case Integer:
        println "Integer: ${o.longValue()}" //currently only in dynamic Groovy 
        break
      default:
        throw new IllegalArgumentException(o.toString())
    }
}

The same as currently for if with instanceof:

if (o instanceof String) {
    useString(o)
}

Issue Links

• duplicates: GROOVY-8411 Support instanceof-like flow typing for class literal switch case