Generic Stack (C++)
Contents
Description
This example demonstrates the usage of a generic stack in C++Builder. This example uses the header <stack> from the Dinkumware Standard C++ Library (STL).
Code
#include <stack>
#include <iostream>
using namespace std;
// ---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender) {
// Create the stack
stack<UnicodeString>stk;
// Add elements to the stack
stk.push("John");
stk.push("Mary");
stk.push("Bob");
stk.push("Anna");
stk.push("Erica");
// Show the last pushed element "Erica"
MessageDlg("Last elemnt pushed is: " + stk.top(),
TMsgDlgType::mtInformation, TMsgDlgButtons() << TMsgDlgBtn::mbOK, 0);
// Pop the last pushed element
stk.pop();
// Show the number of elements in the stack "4"
MessageDlg("The stack contains: " + IntToStr((int)stk.size()) +
" elements.", TMsgDlgType::mtInformation,
TMsgDlgButtons() << TMsgDlgBtn::mbOK, 0);
// Show the last pushed element "Anna"
MessageDlg("Last elemnt pushed is: " + stk.top(),
TMsgDlgType::mtInformation, TMsgDlgButtons() << TMsgDlgBtn::mbOK, 0);
// Lambda expression for clearing the stack
// This piece of code will execute only for 64-bit C++ applications
#ifdef _WIN64
[&]
() {
stack<UnicodeString>empty;
swap(stk, empty);
}();
#endif
// Show the number of elements in the stack "0"
MessageDlg("The stack contains: " + IntToStr((int)stk.size()) +
" elements.", TMsgDlgType::mtInformation,
TMsgDlgButtons() << TMsgDlgBtn::mbOK, 0);
}
// ---------------------------------------------------------------------------