NoThrowFlags

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

In CCore we need to determine two type properties: if a type has a nothrow default constructor (or has no the default constructor at all) and if a type has a nothrow copy constructor (or has no the copy constructor at all). NoThrowFlags is a tool which declare these type properties of a class. You are responsible that the declaration is correct!

Th declare class properties the base class SetNoThrowFlags is used:

class SomeClass : public SetNoThrowFlags<SomeClass, /* Default_no_throw */ true, /* Copy_no_throw */ true>
 {
  ....
 };

If a class has no such base class, the default way to determine these class properties is used. To do it the standard Meta-functions std::is_default_constructible and other are used. If a "bad" result is encountered (false) a warning is emitted. You can set these properties true by adding the noexcept qualifier to the declaration of the default or copy constructor.

class SomeClass
 {
  public:

   SomeClass() noexcept;

   SomeClass(const SomeClass &obj) noexcept;
 };

To retrieve NoThrowFlags the following Meta-class is used:

template <class T>
struct GetNoThrowFlags
 {
  enum NoThrowFlagType
   {
    Default_no_throw = ....,
    Copy_no_throw = ....
   };
 };