Move semantics(C++11)
/*
* Compile with:
* g++ move_test.c -o move_test -std=c++11 -g -fno-elide-constructors
* -fno-elide-constructors disabled the return value optimize.
*/
#include <iostream>
#include <utility>
class A {
public:
A(void)
{
a = new int;
std::cout << "Constructing(normal) A" << (void *)this << std::endl;
}
A(const class A &other)
{
std::cout << "Constructing(copy) A" << (void *)this << std::endl;
}
A(class A &&other)
{
std::cout << "Constructing(move) A" << (void *)this << std::endl;
a = other.a;
other.a = NULL;
}
~A(void)
{
std::cout << "Destructing A" << (void *)this << std::endl;
delete a;
}
void set(int i)
{
*a = i;
}
int get(void)
{
return *a;
}
private:
int *a;
};
class B {
private:
class A a;
public:
B(void)
{
std::cout << "Constructing(normal) B" << (void *)this << std::endl;
}
B(const class B &other)
: a(other.a)
{
std::cout << "Constructing(copy) B" << (void *)this << std::endl;
}
B(class B &&other)
:a(std::move(other.a))
{
std::cout << "Constructing(move) B" << (void *)this << std::endl;
}
~B(void)
{
std::cout << "Destructing B" << (void *)this << std::endl;
}
void set(int i)
{
a.set(i);
}
int get(void)
{
a.get();
}
};
class B func(void)
{
class B b;
b.set(23);
std::cout << "function Seperating..." << std::endl;
std::cout << b.get() << std::endl;
return b;
}
int main(void)
{
class B b(func());
std::cout << b.get() << std::endl;
b.set('w');
std::cout << "Seperating..." << std::endl;
std::cout << b.get() << std::endl;
return 0;
* Compile with:
* g++ move_test.c -o move_test -std=c++11 -g -fno-elide-constructors
* -fno-elide-constructors disabled the return value optimize.
*/
#include <iostream>
#include <utility>
class A {
public:
A(void)
{
a = new int;
std::cout << "Constructing(normal) A" << (void *)this << std::endl;
}
A(const class A &other)
{
std::cout << "Constructing(copy) A" << (void *)this << std::endl;
}
A(class A &&other)
{
std::cout << "Constructing(move) A" << (void *)this << std::endl;
a = other.a;
other.a = NULL;
}
~A(void)
{
std::cout << "Destructing A" << (void *)this << std::endl;
delete a;
}
void set(int i)
{
*a = i;
}
int get(void)
{
return *a;
}
private:
int *a;
};
class B {
private:
class A a;
public:
B(void)
{
std::cout << "Constructing(normal) B" << (void *)this << std::endl;
}
B(const class B &other)
: a(other.a)
{
std::cout << "Constructing(copy) B" << (void *)this << std::endl;
}
B(class B &&other)
:a(std::move(other.a))
{
std::cout << "Constructing(move) B" << (void *)this << std::endl;
}
~B(void)
{
std::cout << "Destructing B" << (void *)this << std::endl;
}
void set(int i)
{
a.set(i);
}
int get(void)
{
a.get();
}
};
class B func(void)
{
class B b;
b.set(23);
std::cout << "function Seperating..." << std::endl;
std::cout << b.get() << std::endl;
return b;
}
int main(void)
{
class B b(func());
std::cout << b.get() << std::endl;
b.set('w');
std::cout << "Seperating..." << std::endl;
std::cout << b.get() << std::endl;
return 0;
}
Running results:
Constructing(normal) A0xbf965d1c
Constructing(normal) B0xbf965d1c
function Seperating...
23
Constructing(move) A0xbf965d4c
Constructing(move) B0xbf965d4c
Destructing B0xbf965d1c
Destructing A0xbf965d1c
Constructing(move) A0xbf965d48
Constructing(move) B0xbf965d48
Destructing B0xbf965d4c
Destructing A0xbf965d4c
23
Seperating...
119
Destructing B0xbf965d48
Destructing A0xbf965d48