122 lines
2.5 KiB
C++
122 lines
2.5 KiB
C++
#include <iostream>
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#include <cassert>
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#include <vector>
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#include "../helpers/println.hpp"
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struct StackObject {
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private:
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void* operator new(size_t size) noexcept {
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bool noStackObjectOnHeap = false;
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assert(noStackObjectOnHeap);
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return nullptr;
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}
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};
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class HeapObject{
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public:
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void* operator new (size_t size);
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HeapObject();
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virtual ~HeapObject();
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static bool assertionsHold();
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protected:
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private:
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static int ctorCount;
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static int dtorCount;
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static int newCount;
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// static void remove(HeapObject *);
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HeapObject(const HeapObject&) = delete;
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HeapObject& operator=(const HeapObject&) = delete;
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};
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int HeapObject::ctorCount = 0;
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int HeapObject::dtorCount = 0;
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int HeapObject::newCount = 0;
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void* HeapObject::operator new (size_t size){
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newCount++;
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return new char[size];
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}
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HeapObject::HeapObject(){
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ctorCount++;
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}
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HeapObject::~HeapObject(){
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dtorCount++;
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}
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bool HeapObject::assertionsHold(){
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assert(ctorCount == newCount); // all objects have been allocated on heap
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assert(ctorCount == dtorCount); // all objects have been deleted
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return true;
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}
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typedef double MoneyUnitType; // should be fixed point class
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class Cash : public HeapObject {
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public:
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MoneyUnitType _value;
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Cash(MoneyUnitType value) : _value(value){}
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};
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typedef std::vector<Cash*> Wallet;
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Wallet consumerWallet_A;
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Wallet consumerWallet_B;
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Cash * createCashFor(int i){
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return new Cash(i);
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}
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void flushWallet(Wallet& toBeEmptied){ // should be in dtor of sorrounding class
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for(int i=0; i<toBeEmptied.size();i++){
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delete toBeEmptied[i];
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}
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toBeEmptied.clear();
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}
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void setup(){
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println("setup()...");
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// fill A's wallet
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for(int i=1;i<=10;i++){
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consumerWallet_A.push_back(createCashFor(i));
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}
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println("setup() - done");
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}
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void simulate(){
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println("simulate()...");
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// move A's last Cash object to B's wallet
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Cash * toBeMoved = consumerWallet_A.back();
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consumerWallet_B.push_back(toBeMoved);
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consumerWallet_A.pop_back();
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// delete A's last Cash object
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delete consumerWallet_A.back();
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consumerWallet_A.pop_back();
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println("simulate() - done");
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}
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void teardown(){
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println("cleaning up...");
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flushWallet(consumerWallet_A);
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flushWallet(consumerWallet_B);
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println("cleaning up - done");
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}
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int main(int argc, const char * argv[]) {
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setup();
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simulate();
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teardown();
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HeapObject::assertionsHold();
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std::cout << " ---- errors above? ----" << std::endl;
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return 0;
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}
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