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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++

LANG.FUNCS.CILC : Confusing Initializer-list Constructor

Summary

FIXME

Properties

Class Name Confusing Initializer-list Constructor
Significance style
Mnemonic LANG.FUNCS.CILC
Categories
MisraC++2023 MisraC++2023:15.1.5 A class shall only define an initializer-list constructor when it is the only constructor
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="Confusing Initializer-list Constructor"
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 <initializer_list>

class Bad {
public:
    Bad( const std::initializer_list<int> &il ) : x(0)    // 'Confusing Initializer-list Constructor' warning issued here
    {
        for (auto v : il)
            x += v;
    }
    Bad( int a, int b ) : x(a*b) {}                       // Confusing alternative constructor
    int get() const { return x; }
private:
    int x;
};

class Good {
public:
    Good( const std::initializer_list<int> & il ) : x(0)  // OK: no confusing alternative constructor
    {
        for (auto v : il)
            x += v;
    }
    Good( const Good & other ) : x(other.x) {}            // Copy constructor allowed
    int get() const { return x; }
private:
    int x;
};

int confusing_initialize_list_constructor( void )
{
    Bad b1{ 3, 4 };     // 7
    Bad b2( 3, 4 );     // 12
    Good g1{ 3, 4 };    // 7
    Good g2( g1 );      // 7

    return b1.get() + b2.get() + g1.get() + g2.get();   // 33
}

Relevant Configuration File Parameters

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

 

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