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smartpointer demo

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This commit is contained in:
Christoph Urlacher
2022-07-19 21:43:10 +02:00
parent 1519e08072
commit a827e1d809
2 changed files with 94 additions and 3 deletions
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7
c_os/user/MainMenu.cc
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@ -7,6 +7,7 @@
#include "user/demo/LinkedListDemo.h" #include "user/demo/LinkedListDemo.h"
#include "user/demo/PCSPKdemo.h" #include "user/demo/PCSPKdemo.h"
#include "user/demo/PreemptiveThreadDemo.h" #include "user/demo/PreemptiveThreadDemo.h"
#include "user/demo/SmartPointerDemo.h"
#include "user/demo/TextDemo.h" #include "user/demo/TextDemo.h"
#include "user/demo/VBEdemo.h" #include "user/demo/VBEdemo.h"
@ -68,9 +69,9 @@ void MainMenu::run() {
case 'e': case 'e':
choosen_demo = new ArrayDemo(); choosen_demo = new ArrayDemo();
break; break;
// case 'r': case 'r':
// choosen_demo = new SmartPointerDemo(); choosen_demo = new SmartPointerDemo();
// break; break;
} }
if (choosen_demo != NULL) { if (choosen_demo != NULL) {

90
c_os/user/demo/SmartPointerDemo.cc Normal file
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@ -0,0 +1,90 @@
#include "user/demo/SmartPointerDemo.h"
#include "user/lib/mem/UniquePointer.h"
// #include <memory>
void SmartPointerDemo::run() {
kout.clear();
kout << "Output is written to log to be able to trace memory allocations/deallocations" << endl;
// <memory> legit smartpointer
// {
// log << INFO << "Allocating new unique_ptr<int>..." << endl;
// std::unique_ptr<int> ptr1 = std::make_unique<int>(1);
// std::unique_ptr<int> ptr2 = std::make_unique<int>(2);
// log << INFO << "Moving..." << endl;
// ptr2 = std::move(ptr1);
// log << INFO << "Leaving scope..." << endl;
// }
// log << INFO << "Should be deleted by now..." << endl;
{
log << INFO << "Allocating new unique_ptr<int>..." << endl;
bse::unique_ptr<int> ptr = bse::make_unique<int>(1);
log << INFO << "Leaving scope..." << endl;
}
log << INFO << "Should be deleted by now..." << endl;
{
log << INFO << "Allocating new unique_ptr<int>..." << endl;
bse::unique_ptr<int> ptr1 = bse::make_unique<int>(1);
bse::unique_ptr<int> ptr2;
log << INFO << "*ptr1 == " << *ptr1 << ", (bool)ptr2 == " << (bool)ptr2 << endl;
log << INFO << "Moving ptr1 => ptr2 (no allocations should happen)..." << endl;
// ptr2 = ptr1; // Doesn't work, copy assignment is deleted
ptr2 = std::move(ptr1);
log << INFO << "(bool)ptr1 == " << (bool)ptr1 << ", *ptr2 == " << *ptr2 << endl;
log << INFO << "Leaving scope..." << endl;
}
log << INFO << "Should be deleted by now..." << endl;
{
log << INFO << "Allocating (2) new unique_ptr<int>..." << endl;
bse::unique_ptr<int> ptr1 = bse::make_unique<int>(1);
bse::unique_ptr<int> ptr2 = bse::make_unique<int>(1);
log << INFO << "Moving ptr1 => ptr2 (ptr1 should be freed)..." << endl;
ptr2 = std::move(ptr1);
log << INFO << "Leaving scope..." << endl;
}
log << INFO << "Should be deleted by now..." << endl;
// =====================================================================
{
log << INFO << "Allocating new unique_ptr<int[]>..." << endl;
bse::unique_ptr<int[]> ptr = bse::make_unique<int[]>(10);
ptr[0] = 1;
log << INFO << "ptr[0] == " << ptr[0] << endl;
}
log << INFO << "Should be deleted by now..." << endl;
{
log << INFO << "Allocating new unique_ptr<int[10]>..." << endl;
bse::unique_ptr<int[]> ptr1 = bse::make_unique<int[]>(10);
bse::unique_ptr<int[]> ptr2;
log << INFO << "Moving ptr1 => ptr2 (no allocations should happen)..." << endl;
ptr2 = std::move(ptr1);
log << INFO << "Leaving scope..." << endl;
}
log << INFO << "Should be deleted by now..." << endl;
{
log << INFO << "Allocating (2) new unique_ptr<int[10]>..." << endl;
bse::unique_ptr<int> ptr1 = bse::make_unique<int>(10);
bse::unique_ptr<int> ptr2 = bse::make_unique<int>(10);
log << INFO << "Moving ptr1 => ptr2 (ptr1 should be freed)..." << endl;
ptr2 = std::move(ptr1);
log << INFO << "Leaving scope..." << endl;
}
log << INFO << "Should be deleted by now..." << endl;
scheduler.exit();
}