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#ifndef _APSTRING_H
#define _APSTRING_H
#include <iostream>
//#include "bool.h"
//****************************************************************
//
// apstring class
//
//****************************************************************
extern const int npos; // Returned by the find function if
// the target char or substring is not found
class apstring {
public:
// Constructors/destructor:
apstring(); // Default constructor: builds an
// empty string (of 0 length and capacity)
apstring(const char * s);
// Builds a string from a null-terminated
// string (e.g., a literal string)
apstring(const apstring &str);
// Copy constructor: builds a string equal to
// a given string
~apstring(); // Destructor
// Assignment:
const apstring &operator= (const apstring &str);
// str1 = str2;
const apstring &operator= (const char *s);
// str = "Hello";
const apstring &operator= (char ch);
// str = ch;
// Overloaded subscripting operators (perform subscript range checking):
char operator[] (int k) const; // for use as an rvalue
char &operator[] (int k); // for use as lvalue
// Append operators:
const apstring &operator+= (const apstring &str);
// str1 += str2;
const apstring &operator+= (char ch);
// str += ch;
// Other member functions:
int length() const; // Returns the current length of the string
int find(const apstring &str) const;
// Returns index of first occurrence of str
int find(char ch) const; // Returns index of first occurrence of ch
apstring substr(int pos, int len) const;
// Builds and returns a substring of len chars,
// starting at pos
const char *c_str() const;
// Returns const pointer to the
// null-terminated string in storage buffer
private:
int mLength; // Current length of the string (number of characters)
int mCapacity; // The size of the string buffer
char *mCstring; // Pointer to a null-terminated string
// in the storage buffer
};
//****************************************************************
//********* Free-standing operators and functions *********
//****************************************************************
// I/O functions:
std::ostream &operator<< (std::ostream &os, const apstring &str);
std::istream &operator>> (std::istream &is, apstring &str);
std::istream &getline(std::istream &is, apstring &str);
// Concatenation operators:
apstring operator+ (const apstring &str1, const apstring &str2);
apstring operator+ (char ch, const apstring &str);
apstring operator+ (const apstring &str, char ch);
// Relational operators:
bool operator== (const apstring &str1, const apstring &str2);
bool operator!= (const apstring &str1, const apstring &str2);
bool operator< (const apstring &str1, const apstring &str2);
bool operator<= (const apstring &str1, const apstring &str2);
bool operator> (const apstring &str1, const apstring &str2);
bool operator>= (const apstring &str1, const apstring &str2);
//#include "apstring.cpp"
// Continued in apstring.cpp...
#endif // _APSTRING_H
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