If the implicitly-declared default constructor is not defined as deleted, it is defined (that is, a function body is generated and compiled) by the compiler if odr-used or needed for constant evaluation (since C++11), and it has the same effect as a user-defined constructor with empty body and empty initializer list. The implicitly-declared (or defaulted on its first declaration) default constructor has an exception specification as described in dynamic exception specification (until C++17) exception specification (since C++17). If some user-declared constructors are present, the user may still force the automatic generation of a default constructor by the compiler that would be implicitly-declared otherwise with the keyword default. If no user-declared constructors of any kind are provided for a class type ( struct, class, or union), the compiler will always declare a default constructor as an inline public member of its class. Such constructor is treated as user-provided (see below and value initialization).ĭefault constructors are called during default initializations and value initializations. 5) Defaulted default constructor outside of class definition (the class must contain a declaration (1)).
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