C string類 模擬實現

#define _crt_secure_no_warnings 

#include
#include
using
namespace std;
namespace zyf 
iterator end()
mystring
(const
char
* str ="")
:_size
(strlen
(str))~
mystring()
//s1(s2)
mystring
(const mystring& s)
//s1 = s2
mystring&
operator=(
const mystring& s)
return
*this;}
size_t size()
const
size_t capacity()
const
char
&operator
(size_t pos)
const
char
&operator
(size_t pos)
const
void
reserve
(size_t n)
}void
resize
(size_t n,
char ch =
'\0'
)else
}'x');
void
push_back
(char ch)
_str[_size]
= ch;
++_size;
_str[_size]
='\0';}
void
(const
char
* str)
//s1 += 'x'
mystring&
operator+=
(char ch)
//s1 += "***xx"
mystring&
operator+=
(const
char
* str)
mystring&
insert
(size_t pos,
char ch)
_str[pos]
= ch;
++_size;
return
*this;}
mystring&
insert
(size_t pos,
const
char
* str)
strncpy
(_str + pos, str, len)
;//在pos位置拷貝len個位元組，不拷貝'\0'所以不用strcpy
_size +
= len;
return
*this;}
void
erase
(size_t pos, size_t len = npos)
else
} size_t find
(char ch, size_t pos =0)
return npos;
} size_t find
(const
char
* str, size_t pos =0)
//s1 < s2
//實現《和=，復用實現其他比較
bool
operator
<
(const mystring& s)
bool
operator==(
const mystring& s)
bool
operator
<=
(const mystring& s)
bool
operator
>
(const mystring& s)
bool
operator
>=
(const mystring& s)
bool
operator!=(
const mystring& s)
private
:char
* _str;
size_t _size;
size_t _capacity;
static size_t npos;};
size_t mystring::npos =-1
;//整形最大數
ostream&
operator
<<
(ostream& out,
const mystring& s)
istream&
operator
>>
(istream& in, mystring& s)
return in;}}
void
test1()
cout << endl;
zyf::mystring::iterator it1 = s1.
begin()
;//遍歷+讀寫
while
(it1 != s1.
end())
cout << endl;
for(
auto
& ch : s1)
cout << endl;
zyf::mystring s2
("hello");
s2 +
='x'
; s2.
resize(3
);s2.
resize(7
,'x');
s2.resize(15
,'x');
}void
test2()
intmain()

#define _crt_secure_no_warnings

#include
#include
using
namespace std;
namespace zyf 
/*傳統深拷貝寫法
string(const string&s) 
:_str(new char[strlen(s._str) + 1]) 
string& operator=(const string&s) 
return *this;
}*/mystring
(const mystring& s)
//現**法
:_str
(nullptr
)//若自己給自己賦值，僅交換空間
mystring&
operator
=(mystring s)
/*mystring& operator=(const mystring &s) 
return *this;
}*/~mystring()
const
char
*c_str()
private
:char
*_str;};
}/*template//交換變數自身
void swap(t&x1, t&x2) */
intmain()

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