SimTK::ReinitOnCopy< T > Class Template Reference

Ensures that a data member of type T is automatically reinitialized to a given initial value upon copy construction or copy assignment. This allows the compiler-generated default copy methods to be used. More...

Inheritance diagram for SimTK::ReinitOnCopy< T >:

Public Member Functions
	ReinitOnCopy ()=delete
	Default constructor is deleted; use ResetOnCopy instead. More...
	ReinitOnCopy (const T &value)
	Construct or implicitly convert from an object of type T. This sets both the current and remembered initial value to the given value. More...
	ReinitOnCopy (T &&value)
	Construct or implicitly convert from an rvalue object of type T. This sets both the current and remembered initial value to the given value. More...
	ReinitOnCopy (const ReinitOnCopy &source)
	Copy constructor sets the value and remembered initial value to the initial value in the source, using type T's copy constructor. More...
	ReinitOnCopy (ReinitOnCopy &&source)
	Move constructor is simply a pass-through to the move constructor of the contained object for both the current and initial values. More...
ReinitOnCopy &	operator= (const ReinitOnCopy &ignored)
	Copy assignment reinitializes this object to its original condition; the source argument is ignored. More...
ReinitOnCopy &	operator= (ReinitOnCopy &&source)
	Move assignment uses type T's move assignment for the current value but does not change the remembered initial value here. More...
ReinitOnCopy &	operator= (const T &value)
	Assignment from an object of type T uses T's copy assignment operator; affects only the current value but does not change the remembered initial value. More...
ReinitOnCopy &	operator= (T &&value)
	Assignment from an rvalue object of type T uses T's move or copy assignment operator; affects only the current value but does not change the remembered initial value. More...
const T &	getT () const
	Return a const reference to the contained object of type T. More...
T &	updT ()
	Return a writable reference to the contained object of type T. More...
const T &	getReinitT () const
	(Advanced) Return a const reference to the stored initial value. More...
T &	updReinitT ()
	(Advanced) Return a writable reference to the stored initial value. Use of this should be rare and restricted to constructors. More...

Detailed Description

template<class T>
class SimTK::ReinitOnCopy< T >

Ensures that a data member of type T is automatically reinitialized to a given initial value upon copy construction or copy assignment. This allows the compiler-generated default copy methods to be used.

The template type T here is required to be CopyAssignable, CopyConstructible, and Destructible, and cannot be an array type. There is space overhead here for one extra copy of T used to hold the initial value. The default constructor is suppressed here; if you just need the data member reset to zero or to its default-constructed value, use class ResetOnCopy<T> instead. That class has zero overhead and accepts a wider range of template arguments.

Here are some usage examples:

class Thing {
    // Must provide an initial value; no default construction allowed.

    ReinitOnCopy<int>         m_which{-1};          // reinit to -1 on copy
    ReinitOnCopy<string>      m_name{"unknown"};    // back to "unknown" on copy
    ReinitOnCopy<const char*> m_desc{"none given"}; // similar
    ReinitOnCopy<Color>       m_color{Blue};        // works for enums

    // An example where ResetOnCopy is better.
    ResetOnCopy<unsigned>     m_count1;     // reset to 0 on copy; no overhead
    ReinitOnCopy<unsigned>    m_count2;     // error; no default construction
    ReinitOnCopy<unsigned>    m_count3{0};  // ok, but has space overhead

    // An example where ResetOnCopy is necessary (T doesn't allow copying).
    ResetOnCopy<std::unique_ptr<Something>> m_myThing;
};

Other than copy behavior, an object of type ReinitOnCopy<T> behaves just like the underlying object of type T. It will implicitly convert to T when needed, and inherit constructors, assignment, and other methods from T. Move construction and move assignment behave as they would for T, and an assignment from an object of type T to an object of type ReinitOnCopy<T> will invoke T's ordinary copy assignment operator if there is one, and fail to compile if an attempt is made to use a non-existent assignment operator.

Template Parameters

T	Template type that is a numeric, character, enum, or pointer built-in type, or a class type that is CopyConstructible, CopyAssignable, and Destructible. Array types are not allowed.

See also

ResetOnCopy if you only need to reinitialize to the default value.

Constructor & Destructor Documentation

template<class T >

SimTK::ReinitOnCopy< T >::ReinitOnCopy ( )

delete

Default constructor is deleted; use ResetOnCopy instead.

template<class T >

SimTK::ReinitOnCopy< T >::ReinitOnCopy ( const T &  value )

inline

Construct or implicitly convert from an object of type T. This sets both the current and remembered initial value to the given value.

template<class T >

SimTK::ReinitOnCopy< T >::ReinitOnCopy ( T &&  value )

inline

Construct or implicitly convert from an rvalue object of type T. This sets both the current and remembered initial value to the given value.

template<class T >

SimTK::ReinitOnCopy< T >::ReinitOnCopy ( const ReinitOnCopy< T > &  source )

inline

Copy constructor sets the value and remembered initial value to the initial value in the source, using type T's copy constructor.

The current value of the source is ignored.

template<class T >

SimTK::ReinitOnCopy< T >::ReinitOnCopy ( ReinitOnCopy< T > &&  source )

inline

Move constructor is simply a pass-through to the move constructor of the contained object for both the current and initial values.

Member Function Documentation

template<class T >

ReinitOnCopy& SimTK::ReinitOnCopy< T >::operator= ( const ReinitOnCopy< T > &  ignored )

inline

Copy assignment reinitializes this object to its original condition; the source argument is ignored.

template<class T >

ReinitOnCopy& SimTK::ReinitOnCopy< T >::operator= ( ReinitOnCopy< T > &&  source )

inline

Move assignment uses type T's move assignment for the current value but does not change the remembered initial value here.

template<class T >

ReinitOnCopy& SimTK::ReinitOnCopy< T >::operator= ( const T &  value )

inline

Assignment from an object of type T uses T's copy assignment operator; affects only the current value but does not change the remembered initial value.

template<class T >

ReinitOnCopy& SimTK::ReinitOnCopy< T >::operator= ( T &&  value )

inline

Assignment from an rvalue object of type T uses T's move or copy assignment operator; affects only the current value but does not change the remembered initial value.

template<class T >

const T& SimTK::ReinitOnCopy< T >::getT ( ) const

inline

Return a const reference to the contained object of type T.

template<class T >

T& SimTK::ReinitOnCopy< T >::updT ( )

inline

Return a writable reference to the contained object of type T.

template<class T >

const T& SimTK::ReinitOnCopy< T >::getReinitT ( ) const

inline

(Advanced) Return a const reference to the stored initial value.

template<class T >

T& SimTK::ReinitOnCopy< T >::updReinitT ( )

inline

(Advanced) Return a writable reference to the stored initial value. Use of this should be rare and restricted to constructors.

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The documentation for this class was generated from the following file:

• ReinitOnCopy.h