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Difference between revisions of "cpp/memory/unique ptr/get deleter"

From cppreference.com
< cpp‎ | memory‎ | unique ptr
m (Text replace - "/sidebar" to "/navbar")
(Added example....)
Line 24: Line 24:
 
{{example |
 
{{example |
 
  | code=
 
  | code=
 +
#include <iostream>
 +
#include <memory>
 +
 +
struct Foo {
 +
    Foo() { std::cout << "Foo...\n"; }
 +
    ~Foo() { std::cout << "~Foo...\n\n"; }
 +
};
 +
 +
struct D{
 +
    void bar(){ std::cout << "Call deleter D::bar()...\n";};
 +
    void operator () (Foo* p) const {
 +
        std::cout << "Call delete for Foo object...\n";
 +
        delete p;
 +
    };
 +
};
 +
 +
int main()
 +
{
 +
    std::unique_ptr<Foo, D> up(new Foo(), D());
 +
    D& del=up.get_deleter();
 +
    del.bar();
 +
}
 
  | output=
 
  | output=
 +
Foo...
 +
Call deleter D::bar()...
 +
Call delete for Foo object...
 +
~Foo...
 
}}
 
}}

Revision as of 14:44, 5 October 2012

 
C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
 
Dynamic memory management
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Allocators
Garbage collection support
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)



 
std::unique_ptr
 

Template:ddcl list begin <tr class="t-dcl ">

<td >
      Deleter& get_deleter();
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

<td >
const Deleter& get_deleter() const;
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

Returns the deleter object which would be used for destruction of the managed object.

Contents

Parameters

(none)

Return value

The stored deleter object.

Exceptions

noexcept specification:  
noexcept
  

Example

Run this code
#include <iostream>
#include <memory>
 
struct Foo {
    Foo() { std::cout << "Foo...\n"; }
    ~Foo() { std::cout << "~Foo...\n\n"; }
};
 
struct D{
    void bar(){ std::cout << "Call deleter D::bar()...\n";};
    void operator () (Foo* p) const {
        std::cout << "Call delete for Foo object...\n";
        delete p;
    };
};
 
int main()
{
    std::unique_ptr<Foo, D> up(new Foo(), D());
    D& del=up.get_deleter();
    del.bar();
}

Output: 

Foo...
Call deleter D::bar()...
Call delete for Foo object...
~Foo...
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