Top: Basic types: string: Operators
#include <ptypes.h>
class string {
// assignment
string& operator =(const char*);
string& operator =(char);
string& operator =(const string&);
friend void assign(string&, const char* buf, int len);
// concatenation
string& operator +=(const char*);
string& operator +=(char);
string& operator +=(const string&);
string operator +(const char*) const;
string operator +(char) const;
string operator +(const string&) const;
friend string operator +(const char*, const string&);
friend string operator +(char c, const string&);
// comparison
bool operator ==(const char*) const;
bool operator ==(char) const;
bool operator ==(const string&) const;
bool operator !=(const char*) const;
bool operator !=(char c) const;
bool operator !=(const string&) const;
// indexed character access, 0-based
char& string::operator[] (int index);
const char& string::operator[] (int index) const;
}
The string class defines the following binary operators: assignment (=), concatenation (+), concatenation with assignment (+=) and comparison (==, !=). At least one of the operands (either left or right) must be of type string. Another operand can be one of the following: char, char* or string.
Indexed access operator allows to store or retrieve a value of an individual character. The index is 0-based. When compiled with either DEBUG or CHECK_BOUNDS conditional symbol, bounds checking is performed for the indexed access; if the index is out of bounds (i.e. less than 0 or equals to or greater than the length of the string), an unrecoverable error is raised. The non-debugging version of the library never checks for index overlfows, thus making your program somewhat faster but less safe.
Examples
string s1 = "abc", s2 = 'd', s3; s3 = s1 + s2; s2 += "ef"; s3[2] = 'B';
See also: Constructors/destructors, Typecasts, Manipulation, Conversion