| Geant4 Cross Reference |
1 #ifndef tools_realloc
2 #define tools_realloc
3
4 #include <cstring> //memcpy
5
6 namespace tools {
7
8 template <class T>
9 inline bool realloc(T*& a_pointer,size_t a_new_size,size_t a_old_size,bool a_init = false) {
10 if(!a_new_size) {
11 delete [] a_pointer;
12 a_pointer = 0;
13 return true;
14 }
15 if(!a_pointer) {
16 a_pointer = new T[a_new_size];
17 if(!a_pointer) return false;
18 return true;
19 }
20 if(a_old_size==a_new_size) return true;
21 T* pointer = new T[a_new_size];
22 if(!pointer) {
23 delete [] a_pointer;
24 a_pointer = 0;
25 return false;
26 }
27 if(a_new_size>a_old_size) {
28 ::memcpy(pointer,a_pointer,a_old_size*sizeof(T));
29 if(a_init){
30 size_t num = a_new_size-a_old_size;
31 T* pos = pointer+a_old_size;
32 for(size_t i=0;i<num;i++,pos++) *pos = T();
33 }
34 } else {
35 ::memcpy(pointer,a_pointer,a_new_size*sizeof(T));
36 }
37 delete [] a_pointer;
38 a_pointer = pointer;
39 return true;
40 }
41
42 }
43
44 #endif