This page presents a simpe example of using a double ended STL container. It is implemented as part of a c++ series of exercises , that I did.

1. The example has simple class, with two fields, float and a string. First the deque is filled and then printed.
   In this example an integer is converted to string using a ostringstream.


1. #include <iostream>
2. //setw setfill
3. #include <iomanip>
4. #include <sstream>
5. #include <string>
6. #include <cassert>
7. #include <deque>
9. using namespace std;
11. class c_block_member {
12.   public:
13.     c_block_member(string name, float f);
14.     string nm;
15.     float fp;
16. };
17. c_block_member::c_block_member(string name, float f) {
18.   nm=name.substr(0);
19.   fp=f;
20. }
22. int main() {
23.   deque<c_block_member> q_block_member;
24.   c_block_member *bm;
25.   unsigned i;
26.   ostringstream os_inst;
27.   string s_inst;
29.   //build deque
30.   for(i=1; i<=10; ++i) {
31.     //default fill is space
32.     os_inst << "U_" << setfill ('0') << setw (8) << i;
33.     s_inst=os_inst.str();
34.     os_inst.str(""); os_inst.clear();
35.     bm = new c_block_member(s_inst, i*(1.2));
36.     q_block_member.push_back(*bm);
37.   }
38.   delete bm;
40.   //print deque
41.   deque<c_block_member>::iterator it;
42.   cout << "dbg " << endl;
43.   for (it = q_block_member.begin(); it!=q_block_member.end(); ++it) {
44.     cout << it->nm << ";" << (*it).fp << endl;
45.   }
46. }


2. To view the content of the deque container, the following gdb commands can be used:
   p *(q_block_member._M_impl._M_start)
   p *(q_block_member._M_impl._M_finish)
   print "%f\n", *(q_block_member._M_impl._M_start)
   print "%f\n", (q_block_member._M_impl._M_start)[0]
   print "%f\n", (q_block_member._M_impl._M_start)[1]
   

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