Gabriele Cosmo
126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
// -*- C++ -*-
|
|
// $Id:$
|
|
// ---------------------------------------------------------------------------
|
|
|
|
#ifndef HEP_STRING_SRC
|
|
#define HEP_STRING_SRC
|
|
|
|
#include <iostream>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* Simplified string class.
|
|
* It provides only few basic functions of the standard <string> and
|
|
* is intended to be used as a replacement of the standard class where
|
|
* full functionality of <string> is not required, but it is essential
|
|
* to have highly portable and effective code.
|
|
*
|
|
* This file should be used exclusively inside *.cc files.
|
|
* Usage inside header files can result to a clash with standard <string>.
|
|
*/
|
|
struct string {
|
|
struct srep {
|
|
char* s; // pointer to data
|
|
int n; // reference count
|
|
srep() : n(1) {}
|
|
} *p;
|
|
|
|
// Default constructor.
|
|
string() { p = new srep; p->s = 0; }
|
|
|
|
// Constructor from character string.
|
|
string(const char* s) {
|
|
p = new srep; p->s = new char[strlen(s)+1]; strcpy(p->s, s);
|
|
}
|
|
|
|
// Constructor from character substring.
|
|
string(const char* s, unsigned int n) {
|
|
p = new srep; p->s = new char[n+1]; strncpy(p->s, s, n); *(p->s+n) = '\0';
|
|
}
|
|
|
|
// Copy constructor from string.
|
|
string(const string& x) { x.p->n++; p = x.p; }
|
|
|
|
// Destructor.
|
|
~string() { if (--p->n == 0) { delete [] p->s; delete p; } }
|
|
|
|
// Assignment from character string.
|
|
string& operator=(const char* s) {
|
|
if (p->n > 1) { // disconnect self
|
|
p->n--;
|
|
p = new srep;
|
|
}else{
|
|
delete [] p->s; // free old string
|
|
}
|
|
p->s = new char[strlen(s)+1];
|
|
strcpy(p->s, s);
|
|
return *this;
|
|
}
|
|
|
|
// Assignment from string.
|
|
string& operator=(const string & x) {
|
|
x.p->n++; // protect against "st = st"
|
|
if (--p->n == 0) { delete [] p->s; delete p; }
|
|
p = x.p;
|
|
return *this;
|
|
}
|
|
|
|
// Returns C-style character string.
|
|
const char* c_str() const { return p->s; }
|
|
};
|
|
|
|
//
|
|
// Concatinations.
|
|
//
|
|
inline string operator+(char a, const string & b) {
|
|
string s; s.p->s = new char[strlen(b.c_str())+2];
|
|
s.p->s[0] = a; strcpy(s.p->s+1, b.c_str());
|
|
return s;
|
|
}
|
|
|
|
inline string operator+(const char * a, const string & b) {
|
|
int lena = strlen(a);
|
|
string s; s.p->s = new char[lena+strlen(b.c_str())+1];
|
|
strcpy(s.p->s, a); strcpy(s.p->s+lena, b.c_str());
|
|
return s;
|
|
}
|
|
|
|
inline string operator+(const string & a, const char * b) {
|
|
int lena = strlen(a.c_str());
|
|
string s; s.p->s = new char[lena+strlen(b)+1];
|
|
strcpy(s.p->s, a.c_str()); strcpy(s.p->s+lena, b);
|
|
return s;
|
|
}
|
|
|
|
inline string operator+(const string & a, const string & b) {
|
|
int lena = strlen(a.c_str());
|
|
string s; s.p->s = new char[lena+strlen(b.c_str())+1];
|
|
strcpy(s.p->s, a.c_str()); strcpy(s.p->s+lena, b.c_str());
|
|
return s;
|
|
}
|
|
|
|
//
|
|
// Comparisons.
|
|
//
|
|
inline bool operator==(const string & x, const char* s) {
|
|
return strcmp(x.p->s, s) == 0;
|
|
}
|
|
inline bool operator==(const string & x, const string & y) {
|
|
return strcmp(x.p->s, y.p->s) == 0;
|
|
}
|
|
inline bool operator!=(const string & x, const char* s) {
|
|
return strcmp(x.p->s, s) != 0;
|
|
}
|
|
inline bool operator!=(const string & x, const string & y) {
|
|
return strcmp(x.p->s, y.p->s) != 0;
|
|
}
|
|
|
|
//
|
|
// Output to a stream.
|
|
//
|
|
std::ostream & operator<<(std::ostream & s, const string & x) {
|
|
return s << x.p->s;
|
|
}
|
|
|
|
#endif /* HEP_STRING_SRC */
|