NoCopy

Files CCore/inc/gadget/NoCopy.h CCore/src/gadget/NoCopy.cpp

NoCopy classes are Property Types and used to disable the implicit copy constructor and the implicit assign operator (and move also). Unlucky, in the C++ a compiler generates these two class members by default, despite they are goodless in most cases.

First of them is the typedef NoCopy.

/* struct NoCopyType */ 

struct NoCopyType
 {
  NoCopyType() = default ;
  
  NoCopyType(const NoCopyType &) = delete ;
   
  void operator = (const NoCopyType &) = delete ;
 };

/* type NoCopy */ 

using NoCopy = NoCopyType ; 

Use it as a base class in a class definition to make a class non-copyable:

class C : NoCopy
 {
 };

Second is the template typedef NoCopyBase.

/* struct ImpNoCopyBase<TT> */

template <class ... TT>
struct ImpNoCopyBase : TT ...
 {
  ImpNoCopyBase() = default ;
    
  ImpNoCopyBase(const ImpNoCopyBase &) = delete ;
   
  void operator = (const ImpNoCopyBase &) = delete ;
 };

/* type NoCopyBase<TT> */
 
template <class ... TT>
using NoCopyBase = ImpNoCopyBase<TT...> ;

Use it as a base class in a class definition to inherit a group of classes and make a class non-copyable:

class D : NoCopyBase<A,B,C>
 {
 };

Why do we need typedefs here? To deal with the following case:

class C : NoCopy
 {
 };

class D : C
 {
  class E : NoCopy // without typedef NoCopy is inaccessible here
   {
   };
 };