List of C/C++ inspections

Constant condition

Analyzes method control and data flow to report conditions that are always true or false and expressions with statically constant values.

tip

Global (default) or Local DFA

Warning

Constant function result

Detects functions whose return value is always equal to the same constant.

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Global DFA

Warning

Constant parameter

Detects functions where a parameter is always equal to the same constant.

tip

Global DFA

Warning

Dangling pointer

Detects pointers that point to invalid data, typical cases are double-free and use-after-free problems. Check out this parent ticket for the list of limitations.

tip

Global (default) or Local DFA

Warning

Endless loop

Detects the for, while, and goto statements that can break only by throwing an exception.

tip

Global (default) or Local DFA

Warning

Infinite recursion

Detects when a function produces infinite recursion.

tip

Global (default) or Local DFA

Warning

Local value escapes scope

Detects variables that reference local values that escape their scope.

tip

Global (default) or Local DFA

Warning

Loop condition isn't updated inside the loop

Detects situations where a loop condition is not updated inside the loop, which can cause an infinite loop.

There is a similar inspection in Clang-Tidy, clang-tidy:bugprone-infinite-loop. However, it doesn’t cover loops with exit points and throws up false positives in cases with lambdas or references. This check is disabled in CLion's default Clang-Tidy profile.

Warning

Null dereference

Detects dereferences of pointers that may contain the nullptr.

tip

Global (default) or Local DFA

Warning

Unreachable calls of function

Detects functions whose call sites are never executed.

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Global DFA

Warning

Unreachable code

Detects the code that is never executed (dead code).

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Global (default) or Local DFA

Warning

Unused local variable

Detects the variables that are declared but not used and never accessed for reading.

Warning

Unused parameter

Detects the parameters that are declared but not used and never accessed for reading.

Warning

Unused value

Reports the cases when the value of a variable is never used after the assignment.

tip

Global (default) or Local DFA

Clear the Warn about unused variable initializers checkbox to disable the inspection for default variable initializers (for example, if you prefer to assign nullptr to the variables of pointer type).

Warning

Hiding non-virtual function

Reports when a function hides non-virtual functions with the same signature from the base class.

Warning

Not implemented functions

Detects when a function is declared but not defined.

Warning

Argument selection defect

Compares the names of arguments in a call and formal parameter names in the declaration to detect the errors like accidental switching of the arguments.

For more information, refer to Inspection: Argument selection defects.

Warning

Clangd errors and warnings

Reports errors and warnings from Clangd. This inspection works in the editor as you type, and you can also get a summary of the results when running inspections manually using Code | Inspect Code.

Empty declaration or statement

Reports the redundant empty declarations and statements that can be safely removed.

Warning

Inconsistent Naming

Reports when a symbol violates the currently selected naming convention.

Find more details in Inspecting code for violations of the naming rules.

Disabled

Preprocessor directive comment

Finds cases where a preprocessor #endif comment doesn’t match the macro name.

Warning

Simplifiable statement

Suggests to simplify the following types of statements:

• condition == true

• condition1? true : condition2

• if(condition1) return true; return condition2;

• statements for identical branches

• if(true) or while(false)

Warning

Unconstrained variable type

Suggests constraining local variables declared as auto if the result of a constrained expression or function call is assigned to them.

This inspection is disabled by default on Windows and is not supported for concepts declared with the requires clause syntax.

Warning

Virtual call from constructor or destructor

Reports when a virtual function is called from a constructor or destructor, helping to prevent situations when virtual functions access the resources that are not yet initialized or have already been destroyed.

Warning

Clang-Tidy

Performs various clang-tidy checks related to C++ Core Guidelines, code modernization, readability, and performance issues.

For more information, refer to Clang-Tidy integration.

Warning

Clazy

Performs Qt-related clazy checks.

Warning

MISRA checks

Performs the checks defined by the MISRA C 2012 and MISRA C++ 2008 guidelines. See the list of currently supported checks.

You can adjust the list of checks in the Options section:

Note that on Windows with MSVC (including the case of clang-cl), CLion shows only the MISRA C++ checks. MISRA C checks can't be shown correctly because they apply to a specific language standard configurable via the -std=cXY flag, which is not supported by MSVC.

note

Requires Use Clang-tidy via Clangd to be enabled in Clangd settings.

Warning

Unused concepts

Detects C++ concepts that are never used.

Warning

Unused global declaration

Detects when a global function or variable is declared but never accessed or written.

Warning

Unused include directive

Reports the unused or unrequired include directives, which can be safely removed.

For more information, refer to Inspection: Unused include directive.

Warning

Unused macro

Detects macro definitions that are never used in the code.

Warning

Unused struct

Detects C/C++ classes and structures that are never used.

Warning

Unused template parameter

Detects C++ class and function template parameters that are never used.

Warning

Unused type alias

Reports using statements that are never used.