Struct B // Y is convertible to int* int *a = Y ( ) + 100.0 // error: no operator+ between pointer and doubleįor operator, the unary operator &, and operator - >, if there are no viable functions (see below) in the set of candidate functions, then the operator is reinterpreted as a built-in. Object: its type is not examined and no conversion sequence is attempted for it.įor the rest of overload resolution, the implied object argument is indistinguishable from other arguments, but the following special rules apply to the implicit object parameter: The member functions introduced by a using-declaration into a derived class are considered to be members of the derived class for the purpose of defining the type of the implicitįor the static member functions, the implicit object parameter is considered to match any

The user-defined conversion functions are considered to be members of the implied object argument for the purpose of determining the type of the implicit object parameter. Similarly, the object on which a member function is being called is prepended to the argument list as the implied object argument.įor member functions of class X, the type of the implicit object parameter is affected by cv-qualifications and ref-qualifications of the member function as described in member functions. If any candidate function is a member function (static or non-static) that does not have an explicit object parameter (since C++23), but not a constructor, it is treated as if it has an extra parameter ( implicit object parameter) which represents the object for which they are called and appears before the first of the actual parameters. Inherited copy and move constructors are not included in the list of candidate functions when constructing a derived class object. If a constructor template or conversion function template has a conditional explicit specifier which happens to be value-dependent, after deduction, if the context requires a candidate that is not explicit and the generated specialization is explicit, it is removed from the candidate set.ĭefaulted move constructor and move assignment that are defined as deleted are never included in the list of candidate functions.

If a name refers to one or more function templates and also to a set of overloaded non-template functions, those functions and the specializations generated from the templates are all candidates. if argument deduction fails or the synthesized function template specialization would be ill-formed, no such function is added to the candidate set.if both succeeds, the template arguments are used to synthesize declarations of the corresponding function template specializations, which are added to the candidate set, and such specializations are treated just like non-template functions except where specified otherwise in the tie-breaker rules.

6 Implicit conversion sequence in list-initializationīefore overload resolution begins, the functions selected by name lookup and template argument deduction are combined to form the set of candidate functions (the exact criteria depend on the context in which overload resolution takes place, see below).įor function templates, template argument deduction and checking of any explicit template arguments are performed to find the template argument values (if any) that can be used in this case:.5 Ranking of implicit conversion sequences.2.7 Reference initialization by conversion.2.6 Non-class initialization by conversion.

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