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Misunderstanding Java operator precedence is a source of frequently asked questions and subtle errors. I was intrigued to learn that even the Java Language Specification says, "It is recommended that code not rely crucially on this specification." JLS §15.7 Preferring clear to clever, are there any…
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In our project, we have implemented the Specification Pattern with boolean operators (see DDD p 274), like so:
public abstract class Rule {
public Rule and(Rule rule) {
return new AndRule(this, rule);
}
public Rule or(Rule rule) {
return new OrRule(this, rule);
…
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Are the two statements below equivalent?
SELECT [...]
FROM [...]
WHERE some_col in (1,2,3,4,5) AND some_other_expr
and
SELECT [...]
FROM [...]
WHERE some_col in (1,2,3) or some_col in (4,5) AND some_other_expr
Is there some sort of truth table I could use to verify this? Thanks.
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Reading some questions here on SO about conversion operators and constructors got me thinking about the interaction between them, namely when there is an 'ambiguous' call. Consider the following code:
class A;
class B {
public:
B(){}
B(const A&) //conversion constructor
…
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struct struct0 {
int a;
};
struct struct1 {
struct struct0 structure0;
int b;
} rho;
&rho->structure0; /* Reference 1 */
(struct struct0 *)rho; /* Reference 2 */
(struct struct0)rho; /* Reference 3 */
From reference 1, does the compiler take the address of rho, and then access structure0…
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