LANG.TYPE.MOVECONST : std::move Argument is const

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CodeSonar^® 9.2p0

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C and C++

LANG.TYPE.MOVECONST : std::move Argument is const

Summary

std::move() is applied to a const argument.

A const object cannot be modified, while move semantics entails invalidating (and thus modifying) the moved-from object. Even if the author is deliberately applying std::move() to a const argument with full understanding of the outcome, the resulting code can be confusing for human readers.

Properties

Class Name

std::move Argument is const

Significance

reliability

Mnemonic

LANG.TYPE.MOVECONST

Categories

AUTOSARC++14	AUTOSARC++14:A18-9-3	The std::move shall not be used on objects declared const or const&.
MisraC++2023	MisraC++2023:28.6.1	The argument to std::move shall be a non-const lvalue
CWE	CWE:1076	Insufficient Adherence to Expected Conventions

Availability

Available for C++ only (not 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="std::move Argument is const"

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

#include <utility>
#include <string>

class C {};

void lang_type_moveconst(void) {
    const C clocal1{};
    C clocal2{};
    C cmove1 = std::move(clocal1);   // 'std::move Argument is const' warning issued here
    C cmove2 = std::move(clocal2);                            // clocal2 is not const
}

Relevant Configuration File Parameters

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

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