powershell - Storing datatypes and embedding them in other datatypes -

i can store data type in variable this

$type = [int] 

and use this:

$type.gettype().name 

but, how can embed in declaration? e.g.

[func[$type]] 

* update *

so invoke-expression trick (thanks mike z). trying create lambda expression. how can now:

$exp = [system.linq.expressions.expression] $ir = [neo4jclient.cypher.icypherresultitem] invoke-expression "`$functype = [func[$ir]]" $ret = $exp::lambda($functype, ...) 

but @petseral , @jan interesting alternatives

this not appear possible directly, @ least according powershell 3.0 specification.

the [type] syntax called type-literal spec , definition not included parts can expressions. composed of type-names composed of type-characters there nothing dynamic them.

reading through spec, noticed works:

$type = [int] $try = read-host $type::"$(if ($try) { 'try' } else { '' })parse" 

now might wonder why $type::$variable allowed. because :: operator who's left hand side expression must evaluate type. right hand side member-name allows simple names, string literals, , use of subexpression operator.

however powershell extremely resilient , can dynamicly via invoke-expression. let's want declare variable generic delegate based on type know @ runtime:

$type = [int] # come somewhere else entirely invoke-expression "`$f = [func[$type]]{ return 1 }"  

now $f has delegate. need test out if $type complex nested or generic type should work basic types. tested [int] , [system.collections.generic.list[int]] worked fine both.