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Object_cache

Object_cache is a native code obtained by AOT compilation.

 

Compare: release cache, debug cache

Operator associativity

Operator associativity is a set of rules determining in what order operators of the same precedence are executed.

Operators can be

• left-associative which means that performed operations are grouped from the left
• right-associative which means that performed operations are grouped from the right
• non-associative which means that operators cannot be grouped at all (usually because of the data type compatibility)

 

Synonym: operator fixity

Compare: operator precedence

Operator precedence

Operator precedence is a set of rules determining in what order operators are executed.

 

The highest possible precedence order (19) means that the operator is the first one to be executed no matter which operators it is combined with. The operator with the precedence order of 1 will be executed after every other operator used in the expression.

Let consider this expression as an example:

a=2+6/2

The / operator is of a higher precedence than +. This means that when this expression is compiled, the compiler evaluates first "6/2" and then "2+". So, b will be equal to 5.

If required, the order of execution can be changed with the help of parentheses.

If we introduce parentheses to the example above, we get:

a=(2+6)/2

Now, the expression in parentheses is evaluated before the / operator, and b becomes equal to 4.

If an expression includes multiple operators of the same precedence, these operators are executed depending on

• their associativity
• their order of appearance

 

Synonym: order of precedence, precedence order

Compare: operator associativity