string class

effect

Things related to string processing , Head for vector, Make a statement of relevant contents .

Basically, the methods used can be the same as general c++ Basically the same way .

iterator

Similar pointer pointing string Related things in the class array .

Spatial growth problem （ Capacity ）

size Returns the valid character length of a string

length Returns the valid character length of a string

capacity Returns the total space size （ The amount of space created ！）

empty Check whether the space is empty , Empty return true, Don't put false

clear Clean up all the strings

void clear();

reserve（size_t n） Let the string become the corresponding space size n

void reserve (size_t n = 0);

resize Re divide n Space , Use all the empty space c Fill in

void resize (size_t n);
void resize (size_t n, char c);

string Object access and traversal

[ ] return pos Character information of position

begin And end iterator

Range for

string Class object modification operation

push back Insert characters c In string

void push_back (char c);

append Append a string to the string str

 iterator string& append (const string& str);// Attach a copy 

string& append (const string& str, size_t subpos, size_t sublen);// Substring with subpos Index start , The length is sublen（ There is no default to npos Specific location information ）

string& append (const char* s);// Copy it all 

string& append (const char* s, size_t n);// front n Go up 

string& append (size_t n, char c);// add to n Characters c

template <class InputIterator>
  string& append (InputIterator first, InputIterator last);
// Connect things in the iterator scope to the end 

operator String is appended after string str‘

c_str return c Format string

const char* c_str() const;

npos Represents the last of the string （ character ） The specific information of the position behind the position .

find Find relevant content information

ize_t find (const string& str, size_t pos = 0) const;
// Looking for from pos Position start to end 
size_t find (const char* s, size_t pos = 0) const;
// ditto 
size_t find (const char* s, size_t pos, size_t n) const;
// Find the string n Something , from pos Location start related information 
size_t find（char c,size_t pos = 0）const;
// Find directly from pos Start 

substr Return character

string substr (size_t pos = 0, size_t len = npos) const;

Interception from pos To the back len Characters

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This part comes to my own learning summary ！ If there is any mistake, please point out ！