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std::unique_ptr::operator bool

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< cpp‎ | memory‎ | unique ptr

 
 
 
Dynamische Speicherverwaltung
Low-Level-Speicherverwaltung
Zuweiser
Original:
Allocators
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allocator
allocator_traits(C++11)
allocator_arg_t(C++11)
allocator_arg(C++11)
uses_allocator(C++11)
scoped_allocator_adaptor(C++11)
Initialisierter Speicher
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Uninitialized storage
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uninitialized_copy
uninitialized_copy_n(C++11)
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
Intelligente Zeiger
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(veraltet)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
Garbage Collection Unterstützung
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Garbage collection support
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declare_reachable(C++11)
undeclare_reachable(C++11)
declare_no_pointers(C++11)
undeclare_no_pointers(C++11)
pointer_safety(C++11)
get_pointer_safety(C++11)
Verschiedenes
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C-Bibliothek
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C Library
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std :: unique_ptr
Member-Funktionen
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Member functions
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unique_ptr::unique_ptr
unique_ptr::~unique_ptr
unique_ptr::operator=
Modifiers
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Modifiers
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unique_ptr::release
unique_ptr::reset
unique_ptr::swap
Beobachter
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Observers
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unique_ptr::get
unique_ptr::get_deleter
unique_ptr::operator bool
unique_ptr::operator*
unique_ptr::operator->
unique_ptr::operator[]
Non-Member-Funktionen
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Non-member functions
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operator==
operator!=
operator<
operator>
operator<=
operator>
operator>=
std::swap
std::hash
 
explicit operator bool() const;
(seit C++11)
Überprüft, ob *this besitzt ein Objekt, dh ob get() == nullptr .
Original:
Checks whether *this owns an object, i.e. whether get() == nullptr.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

(None)
Original:
(none)
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[Bearbeiten] Rückgabewert

true wenn *this besitzt ein Objekt, false sonst .
Original:
true if *this owns an object, false otherwise.
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[Bearbeiten] Ausnahmen

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Beispiel

#include <iostream>
#include <memory>
 
int main()
{
    std::unique_ptr<int> ptr(new int(42));
 
    if (ptr) std::cout << "before reset, ptr is: " << *ptr << '\n';
    ptr.reset();
    if (ptr) std::cout << "after reset, ptr is: " << *ptr << '\n';
}

Output:

before reset, ptr is: 42

[Bearbeiten] Siehe auch

liefert einen Zeiger auf das verwaltete Objekt
Original:
returns a pointer to the managed object
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(öffentliche Elementfunktion) [edit]