LANG.TYPE.MOVENL : std::move Argument is Not Lvalue

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CodeSonar^® 9.2p0

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C and C++

LANG.TYPE.MOVENL : std::move Argument is Not Lvalue

Summary

std::move() is applied to an argument that is not an lvalue.

This is generally not necessary, and suggests that there may be confusion about the code.

Properties

Class Name

std::move Argument is Not Lvalue

Significance

reliability

Mnemonic

LANG.TYPE.MOVENL

Categories

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 Not Lvalue"

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>

std::string a_name(void);

void lang_type_movenl(void) {
    std::string move_name = std::move(a_name()); // 'std::move Argument is Not Lvalue' reported here
    std::string nameret = a_name();
    std::string move_lval_name = std::move(nameret);                          // nameret is an lvalue

    std::string my_strlit = std::move("hello");  // 'std::move Argument is Not Lvalue' reported here
    std::string strlit = "hello";
    std::string my_strlval = std::move(strlit);                               // strlit is an lvalue
}

Relevant Configuration File Parameters

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

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