LANG.LAMBDA.CAPTURE.THIS : Implicit Lambda Capture of this

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CodeSonar^® 9.2p0

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C and C++

LANG.LAMBDA.CAPTURE.THIS : Implicit Lambda Capture of this

Summary

The this pointer is implicitly captured in a lambda expression.

Properties

Class Name

Implicit Lambda Capture of this

Significance

style

Mnemonic

LANG.LAMBDA.CAPTURE.THIS

Categories

AUTOSARC++14	AUTOSARC++14:A5-1-2	Variables shall not be implicitly captured in a lambda expression.
MisraC++2023	MisraC++2023:8.1.1	A non-transient lambda shall not implicitly capture this

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Implicit Lambda Capture of this"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

Example

class A {
    int val;

    int f() {
        auto lambda_implicit = [&]()->int {
            return val;                      // 'Implicit Lambda Capture of this' warning issued here
                                             // - 'this' is captured implicitly only (by reference)
        };

        auto lambda_explicit = [this]()->int {                              // ok: 'this' is captured explicitly.
            return val;
        };

        return lambda_implicit() + lambda_explicit();
    }
};

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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