Order of Evaluation

Most operators do not guarantee a particular order of evaluation for their operands. If an operator does, we mention that fact in its description below. In the absence of such a guarantee, the compiler may rearrange calculations within a single expression as it wishes, if the result would be unchanged ignoring any possible side effects.

For example, if an expression assigns a value to a variable and uses the variable in the same expression, the result is undefined unless an operator that guarantees order of evaluation occurs at an appropriate point.

Note that parentheses do not alter the order of evaluation, but only serve to change the grouping of operators. Thus in the statement

i = foo() + (bar() + baz());

the three functions may be called in any order.

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Operator Grouping Epsilon Extension Language Constants and Identifiers