chaining immutable methods vs functions
Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>
Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>
Thu Jan 16 17:49:22 PST 2014
Why do I get the error message:
Error: immutable method fbool.fbool.and is not callable using a
mutable object
when chaining methods? It works fine using regular function calls?
struct fbool {
ubyte data;
pure immutable fbool and(immutable fbool b){return b.data <
data ? b : this;}
pure immutable fbool or(immutable fbool b){return b.data > data
? b : this; }
pure immutable fbool not(){ return fbool(data^255);}
}
immutable fbool not(immutable fbool a){ return fbool(a.data^255);
}
immutable fbool and(immutable fbool a, immutable fbool b){ return
a.data < b.data ? a : b;}
immutable fbool or(immutable fbool a, immutable fbool b){ return
a.data > b.data ? a : b;}
or(and(not(a),b),and(not(a),b)); //this works
a.not().and(b).or( b.not().and(a) ); // this does not work
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