Overloadeing new operator for the Names class using c++

Posted Date: 24 Aug 2009	Resource Type: Code Snippets	Category: General
Author: Santosh Kumar Singh	Member Level: Gold
Rating:	Points: 4

////////////////////////////////////////
#include
#include
#include
#include

const int maxnames = 5;

////////////////////////////////////////
// The Names class.
////////////////////////////////////////
class Names
{
char name[25];
static char Names::pool[];
static bool Names::inuse[maxnames];

public:
Names(char* s)
{ std::strncpy(name, s, sizeof(name)); }
void* operator new(size_t) throw(bad_alloc);
void operator delete(void*) throw();
void display() const
{ std::cout << name << std::endl; }
};

// Simple memory pool to handle fixed number of Names.
char Names::pool[maxnames * sizeof(Names)];
bool Names::inuse[maxnames];

// Overloaded new operator for the Names class.
void* Names::operator new(size_t) throw(bad_alloc)
{
for (int p = 0; p < maxnames; p++)
{
if (!inuse[p])
{
inuse[p] = true;
return pool+p*sizeof(Names);
}
}
throw bad_alloc();
}

// Overloaded delete operator for the Names class.
void Names::operator delete(void* p) throw()
{
if (p != 0)
inuse[((char*)p - pool) / sizeof(Names)] = false;
}

////////////////////////////////////////
// The main() function.
////////////////////////////////////////
int main()
{
Names* nm[maxnames];
int i;

for (i = 0; i < maxnames; i++)
{
std::cout << std::endl << "Enter name # "
<< i+1 << ": ";
char name[25];
std::cin >> name;
nm[i] = new Names(name);
}

for (i = 0; i < maxnames; i++)
{
nm[i]->display();
delete nm[i];
}

return 0;
}

Responses

Author: Miss Meetu Choudhary 27 Aug 2009

Member Level: Diamond Points : 2

Must add description to your code.

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