c++-gtk-utils
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Cgu::Callback::FunctorArg< FreeArgs > Class Template Reference

Functor class holding a Callback::CallbackArg object. More...

#include <c++-gtk-utils/callback.h>

List of all members.

Public Member Functions

void operator() (typename Cgu::Param< FreeArgs >::ParamType...args) const
FunctorArgoperator= (const FunctorArg &f)
FunctorArgoperator= (FunctorArg &&f)
 FunctorArg (const CallbackArg< FreeArgs...> *cb)
 FunctorArg (const FunctorArg &f)
 FunctorArg (FunctorArg &&f)
 FunctorArg ()

Friends

struct std::hash< FunctorArg >
bool operator== (const FunctorArg &, const FunctorArg &)
bool operator< (const FunctorArg &, const FunctorArg &)

Detailed Description

template<class... FreeArgs>
class Cgu::Callback::FunctorArg< FreeArgs >

Functor class holding a Callback::CallbackArg object.

See also:
SafeFunctorArg
Callback namespace

This class wraps a CallbackArg object. The callback object is kept by SharedPtr so the functor can be copied and offers automatic lifetime management of the wrapped callback object, as well as providing an operator()() function. Ownership is taken of the CallbackArg object passed to the constructor taking a CallbackArg pointer, so that constructor should be treated like a shared pointer constructor - only pass a newly allocated object to it (or copy construct it or assign to it from another existing FunctorArg object). The template types are the types of the unbound arguments, if any. Callback::FunctorArg<> is typedef'ed to Callback::Functor.

The constructor taking a Callback::CallbackArg pointer is not marked explicit, so the results of Callback::make() can be passed directly to a function taking a Callback::FunctorArg argument, and implicit conversion will take place.

Usage

For a class object my_obj of type MyClass, with a method void MyClass::my_method(int, int, const char*), usage for a fully bound functor would be:

using namespace Cgu;
int arg1 = 1, arg2 = 5;
Callback::Functor f{Callback::make(my_obj, &MyClass::my_method, arg1, arg2, "Hello\n")};
f();

Or for a partially bound functor:

using namespace Cgu;
int arg1 = 1, arg2 = 5;
Callback::FunctorArg<int, const char*> f{Callback::make(my_obj, &MyClass::my_method, arg1)};
f(arg2, "Hello\n");

Callback/CallbackArg classes do not provide for a return value. If a result is wanted, users should pass an unbound argument by reference or pointer (or pointer to pointer).

For further background, including about the Callback::make(), Callback::make_ref() and Callback::lambda() functions, and the use of these classes with std::function objects, read this: Callback


Constructor & Destructor Documentation

template<class... FreeArgs>
Cgu::Callback::FunctorArg< FreeArgs >::FunctorArg ( const CallbackArg< FreeArgs...> *  cb)
inline

Constructor of first FunctorArg holding the referenced callback. As it is not marked explicit, it is also a type conversion constructor.

Parameters:
cbThe CallbackArg object which the functor is to manage.
Exceptions:
std::bad_allocThis might throw std::bad_alloc if memory is exhausted and the system throws in that case. Note that if such an exception is thrown, then this constructor will clean itself up and also delete the callback object passed to it.
Note:
std::bad_alloc will not be thrown if the library has been installed using the –with-glib-memory-slices-no-compat configuration option: instead glib will terminate the program if it is unable to obtain memory from the operating system.
template<class... FreeArgs>
Cgu::Callback::FunctorArg< FreeArgs >::FunctorArg ( const FunctorArg< FreeArgs > &  f)
inline

The copy constructor does not throw.

Parameters:
fThe assignor
template<class... FreeArgs>
Cgu::Callback::FunctorArg< FreeArgs >::FunctorArg ( FunctorArg< FreeArgs > &&  f)
inline

The move constructor does not throw.

Parameters:
fThe functor to be moved.
template<class... FreeArgs>
Cgu::Callback::FunctorArg< FreeArgs >::FunctorArg ( )
inline

Default constructor, where a Callback::CallbackArg object is to be assigned later (via the type conversion constructor and/or the assignment operator). This constructor does not throw.


Member Function Documentation

template<class... FreeArgs>
void Cgu::Callback::FunctorArg< FreeArgs >::operator() ( typename Cgu::Param< FreeArgs >::ParamType...  args) const
inline

This will execute the referenced function or class method encapsulated by this class. It will only throw if the executed function or class method throws, or if the copy constructor of the free or a bound argument throws and it is not a reference argument. It is thread safe if the referenced function or class method is thread safe.

Parameters:
argsThe unbound arguments to be passed to the referenced function or class method, if any.
template<class... FreeArgs>
FunctorArg& Cgu::Callback::FunctorArg< FreeArgs >::operator= ( const FunctorArg< FreeArgs > &  f)
inline

This function does not throw.

Parameters:
fThe assignor.
Returns:
The functor object after assignment.
template<class... FreeArgs>
FunctorArg& Cgu::Callback::FunctorArg< FreeArgs >::operator= ( FunctorArg< FreeArgs > &&  f)
inline

This function does not throw.

Parameters:
fThe functor to be moved.
Returns:
The functor object after the move operation.

Friends And Related Function Documentation

template<class... FreeArgs>
bool operator< ( const FunctorArg< FreeArgs > &  ,
const FunctorArg< FreeArgs > &   
)
friend

One FunctorArg object is less than another if the address of the CallbackArg object contained by the first is regarded by std::less as less than the address of the CallbackArg object contained by the other. This comparison operator does not throw.

template<class... FreeArgs>
bool operator== ( const FunctorArg< FreeArgs > &  ,
const FunctorArg< FreeArgs > &   
)
friend

Two FunctorArg objects compare equal if the addresses of the CallbackArg objects they contain are the same. This comparison operator does not throw.

template<class... FreeArgs>
friend struct std::hash< FunctorArg >
friend

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