• chmike (35/35) Jun 08 2016 I have an immutable final class with methods with the following
• chmike (3/5) Jun 08 2016 Sorry, this is the error. It should have been
• NX (3/3) Jun 08 2016 String is an alias for 'immutable(char)[]'.

chmike <christophe meessen.net> writes:

I have an immutable final class with methods with the following 
signature

----
import std.typecons;

immutable class Base{
     ...
      safe pure nothrow
     final Tuple!(int,"value",bool,"hasValue") value(const string 
name) { return nameImpl(value); }
      safe pure nothrow
     protected abstract Tuple!(int,"value",bool,"hasValue") 
valueImpl(const string name);
     ...
}

final immutable class Info: Base{
     ...
      safe pure nothrow
     static Tuple!(int,"value",bool,"hasValue") value(const string 
name)
     {
         auto p = name in name2value_; // <-- Error in this line
         return (p) ? Tuple!(int,"value",bool,"hasValue")(*p,true) 
: Tuple!(int,"value",bool,"hasValue")(int.init,false);
     }
      safe pure nothrow
     protected override Tuple!(int,"value",bool,"hasValue") 
valueImpl(const string name) { return value(name); }
     ...
     enum int[string] name2value_ = [ "info_1" : 1, ...];

}
----

When trying to compile this I get the following error

  Error: function Info.value (const(string) name) immutable is not 
callable using argument types ()

What is the error ? Why is argument types () ?

chmike <christophe meessen.net> writes:

     final Tuple!(int,"value",bool,"hasValue") value(const 
 string name) { return nameImpl(value); }


Sorry, this is the error. It should have been

    final Tuple!(int,"value",bool,"hasValue") value(const
     string name) { return valueImpl(name); }

NX <nightmarex1337 hotmail.com> writes:

String is an alias for 'immutable(char)[]'.

I assume you meant const(char)[] instead of 'const string'?

P.S. always use parentheses.