readability-redundant-parentheses

Detect redundant parentheses.

When modifying code, one often forgets to remove the corresponding parentheses. This results in overly lengthy code. When the expression is complex, finding the matching parentheses becomes particularly difficult.

Example

(1);
((a + 2)) * 3;
(a);
("aaa");

Currently this check does not take into account the precedence of operations. Even if the expression within the parentheses has a higher priority than that outside the parentheses. In other words, removing the parentheses will not affect the semantics.

int a = (1 * 2) + 3; // no warning

Options

AllowedDecls

Semicolon-separated list of regular expressions matching names of declarations to ignore when the parentheses are around. Declarations can include variables or functions. The default is an std::max;std::min.

Some STL library functions may have the same name as widely used function-like macro. For example, std::max and max macro. A workaround to distinguish them is adding parentheses around functions to prevent function-like macro.