移动语义与智能指针
移动语义
为什么要用移动语义？
我们回顾一下之前模拟的String.cc
c
l
a
ss
S
tring
{
pu
b
li
c
:
S
tring
():
_
str
(
new
c
h
a
r
[1]())
{}
S
tring
(
c
onst
c
h
a
r
*
pstr
):
_
str
(
new
c
h
a
r
[
strlen
(
pstr
)
+
1]())
{
str
c
py
(
_
str
,
pstr
);}
S
tring
(
c
onst
S
tring
&
rhs
)
:
_
str
(
new
c
h
a
r
[
strlen
(
rhs
.
c
_
str
())
+
1]())
{
str
c
py
(
_
str
,
rhs
.
c
_
str
());
}
S
tring
&
oper
a
tor
=
(
c
onst
S
tring
&
rhs
){
if
(
this
!
=
&
rhs
){
delete
[]
_
str
;
_
str
=
new
c
h
a
r
[
strlen
(
rhs
.
c
_
str
())
+
1];
str
c
py
(
_
str
,
rhs
.
c
_
str
());
}
return
*
this
;
}
~
S
tring
(){
if
(
_
str
){
delete
[]
_
str
;
_
str
=
nullptr
;
}
}
priv
a
te
:
c
h
a
r
*
_
str
;
};
void test
0(){
S
tring str
(
"
hello
"
);
//
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