Утечка памяти и delete

char *str;
 
while(true) {
// ...
str = "asd";
//delete str ?
}
// или тут delete str ?

while(true) {
// ...
char *str;
str = "asd";
// delete str ?
}

char *str = new char[32];
// delete str;
// or
// delete[] str;

char* s;
while (true)
{
    s = new char[20];
//...
}
delete [] s; //утечка - удалится только память выделенная последним new[]

char* s;
while (true)
{
    s = new char[20];
//...
    delete s; //undefined behaviour - гугл твой лучший друг
}

char Buffer[128];
 
typedef struct IPHeader {
    char *a;
    int b;
} *MyStruct;
...
recv( s, Buffer, sizeof(Buffer), 0 );
...
MyStruct hdr = (MyStruct)Buffer;

char *funct() {
   // может быть так
   char *var = "string";
   // а может быть и так
   char *var = new char[32];
   return var;
}

#include <windows.h>
 
#ifdef _DEBUG
#include <iostream.h>
 
inline void * __cdecl operator new[](unsigned int size, const char *file, int line)
{
    void *ptr = (void *)malloc(size);
    cout << "Memory size of " << size << " bytes allocated to array p(" << ptr << ") in " << file << ":" << line << endl;
    return ptr;
};
 
inline void * __cdecl operator new(unsigned int size, const char *file, int line)
{
    void *ptr = (void *)malloc(size);
    cout << "Memory size of " << size << " bytes allocated p(" << ptr << ") in " << file << ":" << line << endl;
    return ptr;
};
 
inline void __cdecl operator delete(void *p)
{
    cout << "Memory is deleted p(" << p << ")" << endl;
    free(p);
};
inline void __cdecl operator delete[](void *p)
{
    cout << "Memory is deleted from array p(" << p << ")" << endl;
    free(p);
 
};
#endif
 
#ifdef _DEBUG
    #define DEBUG_NEW new(__FILE__, __LINE__)
#else
    #define DEBUG_NEW new
#endif
 
#define new DEBUG_NEW
 
#endif