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1、http://www.cplusplus.com/reference/cstring/ 中右边后涉及的所有功能。（共24个）

2、实现以下功能。（共9个）。功能描述与使用见：

http://www.cplusplus.com/reference/string/

Stoi, stol, stoul, stoll, stoull, stof, stod, stold, to_string

3、Construct string object。（共6个）。功能描述与使用见：http://www.cplusplus.com/reference/string/string/string/

Constructs a string object, initializing its value depending on the constructor version used:

(1) empty string constructor (default constructor)
(2) copy constructor
(3) substring constructor
(4) from c-string
(5) from buffer
(6) fill constructor

4、实现以下功能。（共40个）功能描述与使用见：

http://www.cplusplus.com/reference/string/string/

(destructor), operator=, size, length

Capacity:
size, length, max_size, resize, capacity, reserve, clear, empty, shrink_to_fit

Element access:
operator[], at, back, front

Modifiers:
operator+=, append, push_back, assign, insert, erase, replace, swap, pop_back

String operations:
Data, copy, find, rfind, find_first_of, find_last_of, find_first_not_of, find_last_not_of, substr, compare

Non-member function overloads:
operator+, relational operators, swap, operator>>, operator<<, getline

5、测试 测试以上功能是否正确实现