Synopsis

Constructors that are callable with a single argument are not declared explicit. Conversion operators shall also be set explicit.

Enabled by default

No

Severity/Certainty

Low/Medium

Full description

Constructors that are callable with a single argument are not declared explicit. This means that nothing prevents the constructor from being used to implicitly convert from a fundamental type to the class type. This check is identical to MISRAC++2008-12-1-3, MISRAC++2023-15.1.3.

Coding standards

Code examples

The following code example fails the check and will give a warning:

class C{
  C(double x){} //should be explicit
};

The following code example passes the check and will not give a warning about this issue:

class C{
  explicit C(double x){} //OK
};