CODEWITHSUNDEEP
c++stl
Yoh0xFF
Yoh0xFF

Reputation: 1510

C++ stl, functions with no return type

template<typename _Tp1>
operator auto_ptr_ref<_Tp1>() throw()
{ return auto_ptr_ref<_Tp1>(this->release()); }

template<typename _Tp1>
operator auto_ptr<_Tp1>() throw()
{ return auto_ptr<_Tp1>(this->release()); }

I found definition of this two methods in stl class auto_ptr.

Can somebody explain me please, how functions other then constructors have no return type ?

Upvotes: 2

Views: 171

Answers (2)

user267885
user267885

Reputation:

Because they are implicit conversion operators that return auto_ptr_ref<_Tp1> and auto_ptr<_Tp1> respectively. These themselves serve as return-type declarations.

Upvotes: 6

ForEveR
ForEveR

Reputation: 55887

Conversion operators to type auto_ptr_ref and auto_ptr

n3337 12.3.2/1

A member function of a class X having no parameters with a name of the form

conversion-function-id: operator conversion-type-id

conversion-type-id: type-specifier-seq conversion-declaratoropt

conversion-declarator: ptr-operator conversion-declaratoropt

specifies a conversion from X to the type specified by the conversion-type-id.

Upvotes: 2

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