+2  A: 

Your "constructor" solution sounds about right (semantically at least), in that it forces building something closer to an expression tree than a chain. Another solution would be to pull the evaluation functionality out of the Rule implementations so precedence can be enforced (by walking the chain).

Steven Mackenzie  2010-04-14 12:40:00

related questions

In what order does evaluation of post-increment operator happen?
Why the output for "a" is -80?
How does the different behavior of the unless- and "if !" statement influence the range-operator in scalar context?
simple boolean question
How does operator precedence grouping work in C for *, /, and %?
Are there Ruby precedence issues with using Proc.call vs. Proc.[]?
In Java, what are the boolean "order of operations"?
Java operator precedence guidelines
Which side (left or right) of && (and) operator evaluated in C++
Member access differences.
PowerShell: how *exactly* does the RHS of the -f operator work?
Is there a difference on how java performs operations using shortcut operators from the regular ones?
int[] arr={0}; int value = arr[arr[0]++]; Value = 1?
SQL Logic Operator Precedence: And and Or
C# conditional AND (&&) OR (||) precedence
dereference and advance pointer in one statement?
OR Operator in c#
Understanding evaluation of expressions containing '++' and '->' operators in C.
Prolog operator precedence and rules matching
How do I parenthesize an expression programmatically?
C #define macros
Should One Know Operator Precedence thoroughly?
C++ Mystery
Priority of C++ operators "&" and "->"
Why does the Perl conditional operator not do what I expect?