How to copy function callback? - c++

I have a Timer class that calls function pointer on timeout. The problem that this Times should be able to be copied (instances of it can be swapped in array). After copying the m_callbackOwner became invalid.
So, how to deal with this problem? How to implement callbacks to allow copying?
#pragma once
#include "common/Function.h"
#include "helpers/Utils.h"
template<typename TimeoutCallbackOwner, typename TimeoutCallback>
class Timer
{
public:
Timer() : m_interval(0), m_value(0), m_callbackFunction(nullptr) {}
void setCallback(TimeoutCallbackOwner *cbOwner, TimeoutCallback cb)
{
assert(cbOwner && cb);
m_callbackOwner = cbOwner;
m_callbackFunction = cb;
}
void update(double dt)
{
if (m_interval < 0 || isEqual(m_interval, 0))
{
return;
}
m_value += dt;
if (m_value >= m_interval)
{
m_value = 0;
if (m_callbackOwner, m_callbackFunction)
CALL_MEMBER_FN(m_callbackOwner, m_callbackFunction);
}
}
void setInterval(double interval)
{
m_interval = interval;
m_value = 0;
}
double interval() const
{
return m_interval;
}
double value() const
{
return m_value;
}
bool isRunning() const
{
return m_value != 0;
}
private:
double m_interval;
double m_value;
TimeoutCallbackOwner * m_callbackOwner;
TimeoutCallback m_callbackFunction;
};

Related

qspinbox64 in QT5.15.2

I tried to create a qspinbox64 as suggested in
64bit int Spin Box in QT
qspinbox64.h
#define QSPINBOX64_H
#include <QtGui>
#include <QtWidgets>
namespace Ui {
class QSpinBox64;
}
class QSpinBox64Private;
class Q_WIDGETS_EXPORT QSpinBox64 : public QAbstractSpinBox//QSpinBox
{
Q_OBJECT
Q_PROPERTY(int64_t minimum READ minimum WRITE setMinimum)
Q_PROPERTY(int64_t maximum READ maximum WRITE setMaximum)
Q_PROPERTY(int64_t value READ value WRITE setValue NOTIFY valueChanged USER true)
int64_t m_minimum;
int64_t m_maximum;
int64_t m_value;
public:
explicit QSpinBox64(QWidget *parent = nullptr)
{
connect(lineEdit(), SIGNAL(textEdited(QString)), this, SLOT(onEditFinished()));
}
~QSpinBox64()
{
}
int64_t value() const
{
return m_value;
}
int64_t minimum() const
{
return m_minimum;
}
int64_t maximum() const
{
return m_maximum;
}
void setMinimum(int64_t min)
{
m_minimum = min;
}
void setMaximum(int64_t max)
{
m_maximum = max;
}
void setRange(int64_t min, int64_t max)
{
setMinimum(min);
setMaximum(max);
}
virtual void stepBy(int steps)
{
auto new_value = m_value;
if (steps < 0 && new_value + steps > new_value) {
new_value = std::numeric_limits<qlonglong>::min();
}
else if (steps > 0 && new_value + steps < new_value) {
new_value = std::numeric_limits<qlonglong>::max();
}
else {
new_value += steps;
}
lineEdit()->setText(textFromValue(new_value));
setValue(new_value);
}
protected:
virtual QValidator::State validate(QString &text, int &pos) const
{
//return validator->validate(text, pos);
bool ok;
int64_t val = text.toLongLong(&ok);
if (!ok)
return QValidator::Invalid;
if (val < m_minimum || val > m_maximum)
return QValidator::Invalid;
return QValidator::Acceptable;
}
virtual int64_t valueFromText(const QString &text) const
{
bool ok;
return text.toLongLong(&ok, 10);
}
virtual QString textFromValue(int64_t value) const
{
return QString::number(value, 10).toUpper();
}
virtual QAbstractSpinBox::StepEnabled stepEnabled() const;
public
Q_SLOTS:
void setValue(int64_t val)
{
if (m_value != val) {
lineEdit()->setText(textFromValue(val));
m_value = val;
}
}
void onEditFinished()
{
QString input = lineEdit()->text();
int pos = 0;
if (QValidator::Acceptable == validate(input, pos))
setValue(valueFromText(input));
else
lineEdit()->setText(textFromValue(m_value));
}
Q_SIGNALS:
void valueChanged(int64_t v);
private:
Ui::QSpinBox64 *ui;
Q_DISABLE_COPY(QSpinBox64)
Q_DECLARE_PRIVATE(QSpinBox64)
};
#endif
main.cpp
#include <QHBoxLayout>
#include "qspinbox64.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QSpinBox64 spinBox;
spinBox.setWindowTitle(QObject::tr("QSpinBox64"));
spinBox.show();
return app.exec();
}
An error occurs after compilation:
G:\proj\build-qspinbox64-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\debug\moc_qspinbox64.cpp:141:
error: C2491: 'QSpinBox64::staticMetaObject': definition of dllimport static data member not allowed
What should I do to avoid this error?
The culprit is Q_WIDGETS_EXPORT, defined in qtwidgetsglobal.h
# if defined(QT_BUILD_WIDGETS_LIB)
# define Q_WIDGETS_EXPORT Q_DECL_EXPORT
# else
# define Q_WIDGETS_EXPORT Q_DECL_IMPORT
# endif
You should declare QT_BUILD_WIDGETS_LIB in your project by adding this line to the .pro file
DEFINES += QT_BUILD_WIDGETS_LIB
Some side notes:
You are missing the header guard #ifndef QSPINBOX64_H
The constructor should call the base class constructor and set the min/max as instructed in the original post.
stepEnabled() needs to be implemented
explicit QSpinBox64(QWidget *parent = nullptr) : QAbstractSpinBox{parent}
{
setMaximum(std::numeric_limits<int64_t>::max());
setMinimum(std::numeric_limits<int64_t>::min());
connect(lineEdit(), SIGNAL(textEdited(QString)), this, SLOT(onEditFinished()));
}
virtual QAbstractSpinBox::StepEnabled stepEnabled() const
{
return QAbstractSpinBox::StepUpEnabled | QAbstractSpinBox::StepDownEnabled;
}

'Read access violation' exception in an SFML/C++ project:

I'm recently learning to make a 2d game in SFML using a tutorial series on youtube by Suraj Sharma(Video 57):
https://www.youtube.com/watch?v=kwd_AVCkvXE&list=PL6xSOsbVA1ebkU66okpi-KViAO8_9DJKg&index=57
His Source Code:
https://github.com/Headturna/SFML_RPG
Right now he's teaching me to symplify the game's menu system by making a mini class 'StateData' in the parent class 'State' so any inherited class can access 'State' parameters via 'StateData'(Ex:MainMenu(StData* Stdata){}).
After debugging the game seems to runs fine.But everytime i click on something on the menu(start,settings,etc...) a 'Read access violation:Stdata was nullptr' occurs in the 'State' class constructor.
Here's the code:
State.h:
#pragma once
#ifndef STATE_H
#define STATE_H
#include "Player.h"
#include "GrphSettings.h"
class Player;
class GrphSettings;
class State;
class StData {
public:
StData(){}
//Vars
float GridSize;
sf::RenderWindow* Window;
GrphSettings* GSettings;
std::map<std::string, int>* SupportedKeys;
std::stack<State*>* states;
};
class State
{
private:
protected:
StData* Stdata;
std::stack<State*>* states;
sf::RenderWindow* window;
std::map<std::string, int>* SupportedKeys ;
std::map<std::string, int> Keybinds;
bool quit;
bool pause;
float keyTime;
float keyTimeMax;
float GridSize;
sf::Vector2i MousePosScr;
sf::Vector2i MousePosWind;
sf::Vector2f MousePosView;
//Resources
std::map<std::string,sf::Texture> texture;
//Funcs
virtual void InitKeybinds() = 0;
public:
State(StData* Stdata);
virtual~State();
//Access
const bool getKeytime();
const bool& getquit()const;
//Funcs
void Endstate();
void PauseSt();
void UnPauseSt();
virtual void UpdateInput(const float& dt) = 0;
virtual void UpdateMousePos();
virtual void UpdateKeyTime(const float& dt);
virtual void Update(const float& dt) = 0;
virtual void Render(sf::RenderTarget* target = nullptr) = 0;
};
#endif // !1
State.cpp:
#include "pch.h"
#include "State.h"
State::State(StData* Stdata)
{
this->Stdata = Stdata;
this->window = Stdata->Window;
this->SupportedKeys = Stdata->SupportedKeys;
this->states = Stdata->states;
this->quit = false;
this->pause = false;
this->keyTime = 0.f;
this->keyTimeMax = 10.f;
this->GridSize = Stdata->GridSize;
}
State::~State()
{
}
//Access
const bool State::getKeytime()
{
if (this->keyTime >= this->keyTimeMax) {
this->keyTime = 0.f;
return true;
}
return false;
}
const bool& State::getquit() const
{
// TODO: insert return statement here
return this->quit;
}
//Funcs
void State::Endstate()
{
this->quit = true;
}
void State::PauseSt()
{
this->pause = true;
}
void State::UnPauseSt()
{
this->pause = false;
}
void State::UpdateMousePos()
{
this->MousePosScr = sf::Mouse::getPosition();
this->MousePosWind = sf::Mouse::getPosition(*this->window);
this->MousePosView = this->window->mapPixelToCoords(sf::Mouse::getPosition(*this->window));
}
void State::UpdateKeyTime(const float& dt)
{
if (this->keyTime < this->keyTimeMax)
this->keyTime += 100.f * dt;
}
Every button one the menu(start,exit...)is an inherited state from 'State' class.This is,for example,the 'Edit' state.
Edit.h:
#pragma once
#ifndef EDIT_H
#define EDIT_H
#include "State.h"
#include "Gui.h"
#include "PauseMenu.h"
#include "TileMap.h"
class State;
class Gui;
class PauseMenu;
class TileMap;
class Edit:public State
{
private:
//Vars
sf::Font Fnt;
PauseMenu* PMenu;
std::map<std::string, gui::Button*> buttons;
TileMap Map;
//Functions
void InitVars();
void InitBackGrnd();
void InitFonts();
void InitKeybinds();
void InitPauseMenu();
void InitBtn();
public:
Edit(StData* Stdata);
virtual~Edit();
//Functions
void UpdateInput(const float& dt);
void Update(const float& dt);
void UpdatePButtons();
void UpdateBtn();
void Endstate();
void RenderBtn(sf::RenderTarget& target);
void Render(sf::RenderTarget* target = nullptr);
};
#endif // ! EDIT_H
Edit.cpp:
#include "pch.h"
#include "Edit.h"
void Edit::InitVars()
{
}
void Edit::InitBackGrnd()
{
}
void Edit::InitFonts()
{
if (!this->Fnt.loadFromFile("Fonts/SPACEMAN.ttf")) {
throw("Error::Edit::Couldn't load font");
}
}
void Edit::InitKeybinds()
{
std::ifstream ifs("Config/EditKeys.ini");
if (ifs.is_open()) {
std::string key = "";
std::string key2 = "";
int keyval = 0;
while (ifs >> key >> key2)
{
this->Keybinds[key] = this->SupportedKeys->at(key2);
}
}
ifs.close();
this->Keybinds["Close"] = this->SupportedKeys->at("ESC");
this->Keybinds["Left"] = this->SupportedKeys->at("A");
this->Keybinds["Right"] = this->SupportedKeys->at("D");
this->Keybinds["Up"] = this->SupportedKeys->at("W");
this->Keybinds["Down"] = this->SupportedKeys->at("S");
}
void Edit::InitPauseMenu()
{
this->PMenu = new PauseMenu(*this->window, this->Fnt);
this->PMenu->addButtons("Quit", 800.f, "Quit");
}
void Edit::InitBtn()
{
}
Edit::Edit(StData* Stdata)
:State(Stdata)
{
this->InitVars();
this->InitBackGrnd();
this->InitFonts();
this->InitKeybinds();
this->InitPauseMenu();
this->InitBtn();
}
Edit::~Edit()
{
auto it = this->buttons.begin();
for (it = this->buttons.begin(); it != this->buttons.end(); ++it) {
delete it->second;
}
delete this->PMenu;
}
//Funcs
void Edit::UpdateInput(const float& dt)
{
if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key(this->Keybinds.at("Close")))
&& this->getKeytime()) {
if (!this->pause)
this->PauseSt();
else this->UnPauseSt();
}
}
void Edit::Update(const float& dt)
{
this->UpdateMousePos();
this->UpdateKeyTime(dt);
this->UpdateInput(dt);
if (!this->pause) {//Unpaused
this->UpdateBtn();
}
else {//Paused
this->PMenu->Update(this->MousePosView);
this->UpdatePButtons();
}
this->UpdateBtn();
std::cout << this->MousePosView.x << " " << this->MousePosView.y << "\r";
}
void Edit::UpdatePButtons()
{
if (this->PMenu->isPressed("Quit"))
this->Endstate();
}
void Edit::UpdateBtn()
{ //Update buttons and handle their functions
for (auto& it : this->buttons) {
it.second->Update(MousePosView);
}
}
void Edit::Endstate()
{
std::cout << "Ending State" << "\n";
}
void Edit::RenderBtn(sf::RenderTarget& target)
{
for (auto& it : this->buttons) {
it.second->Render(target);
}
}
void Edit::Render(sf::RenderTarget* target)
{
if (!target)
target = this->window;
this->RenderBtn(*target);
this->Map.Render(*target);
if (this->pause) {//Pause Menu
this->PMenu->Render(*target);
}
sf::Text MText;
MText.setPosition(this->MousePosView);
MText.setFont(this->Fnt);
MText.setCharacterSize(12);
std::stringstream ss;
ss << this->MousePosView.x << ' ' << this->MousePosView.y;
MText.setString(ss.str());
target->draw(MText);
}
Can anyone help me ?

Alternate branching strategies in Gecode

I post here to ask if there is a way to alternate different strategies of branching. Let me explain, I have an efficient branching strategy which we'll call the strategy A. The biggest problem is that the strategy A cannot be used that often. So when I cannot use the strategy A, I use another strategy, which I'll call the strategy B, which is less efficient.
The documentation says that:
Brancher order. Creating a brancher registers it with its home space. A space maintains a queue of its branchers in that the brancher that is registered first is also used first for
branching. The first brancher in the queue of branchers is referred to as the current brancher.
So, I supposed that if I post the brancher A then the brancher B, the brancher A will has priority and each time the status of A says there is no branching to do, the brancher B will be used. Seems like I was wrong because when the status of a brancher return false, it is never called again.
Here is a "minimal example":
#include <gecode/minimodel.hh>
#include <iostream>
using namespace Gecode;
using namespace std;
class MyChoice : public Choice {
public:
int pos; // Position of the variable
int val; // Value of to assign
MyChoice(const Brancher& b, int pos0, int val0)
: Choice(b,2), pos(pos0), val(val0) {}
// Report size occupied
virtual size_t size(void) const {
return sizeof(*this);
}
// Archive into e
virtual void archive(Archive& e) const {
Choice::archive(e);
e << pos << val;
}
};
class BranchA : public Brancher {
protected:
ViewArray<Int::IntView> x;
public:
BranchA(Home home, ViewArray<Int::IntView>& x0)
: Brancher(home), x(x0) {}
static void post(Home home, ViewArray<Int::IntView>& x) {
(void) new (home) BranchA(home,x);
}
virtual size_t dispose(Space& home) {
(void) Brancher::dispose(home);
return sizeof(*this);
}
BranchA(Space& home, bool share, BranchA& b)
: Brancher(home,share,b) {
x.update(home,share,b.x);
}
virtual Brancher* copy(Space& home, bool share) {
return new (home) BranchA(home,share,*this);
}
// status
virtual bool status(const Space& home) const {
for (int i=0; i<x.size(); i++)
if (!x[i].assigned())
return !i%2 && x[i].in(1);
return false;
}
// choice
virtual Choice* choice(Space& home) {
for (int i=0; true; i++)
if (!x[i].assigned())
return new MyChoice(*this,i,1);
GECODE_NEVER;
return NULL;
}
virtual Choice* choice(const Space&, Archive& e) {
int pos, val;
e >> pos >> val;
return new MyChoice(*this, pos, val);
}
// commit
virtual ExecStatus commit(Space& home,
const Choice& c,
unsigned int a) {
const MyChoice& pv = static_cast<const MyChoice&>(c);
int pos=pv.pos, val=pv.val;
if (a == 0)
return me_failed(x[pos].eq(home,val)) ? ES_FAILED : ES_OK;
else
return me_failed(x[pos].nq(home,val)) ? ES_FAILED : ES_OK;
}
};
void branchA(Home home, const IntVarArgs& x) {
if (home.failed()) return;
ViewArray<Int::IntView> y(home,x);
BranchA::post(home,y);
}
// BranchB //////////////////////////////////////////////////////
class BranchB : public Brancher {
protected:
ViewArray<Int::IntView> x;
public:
BranchB(Home home, ViewArray<Int::IntView>& x0)
: Brancher(home), x(x0) {}
static void post(Home home, ViewArray<Int::IntView>& x) {
(void) new (home) BranchB(home,x);
}
virtual size_t dispose(Space& home) {
(void) Brancher::dispose(home);
return sizeof(*this);
}
BranchB(Space& home, bool share, BranchB& b)
: Brancher(home,share,b) {
x.update(home,share,b.x);
}
virtual Brancher* copy(Space& home, bool share) {
return new (home) BranchB(home,share,*this);
}
// status
virtual bool status(const Space& home) const {
for (int i=0; i<x.size(); i++)
if (!x[i].assigned())
return i%2 && x[i].in(2);
return false;
}
// choice
virtual Choice* choice(Space& home) {
for (int i=0; true; i++)
if (!x[i].assigned())
return new MyChoice(*this,i,2);
GECODE_NEVER;
return NULL;
}
virtual Choice* choice(const Space&, Archive& e) {
int pos, val;
e >> pos >> val;
return new MyChoice(*this, pos, val);
}
// commit
virtual ExecStatus commit(Space& home,
const Choice& c,
unsigned int a) {
const MyChoice& pv = static_cast<const MyChoice&>(c);
int pos=pv.pos, val=pv.val;
if (a == 0)
return me_failed(x[pos].eq(home,val)) ? ES_FAILED : ES_OK;
else
return me_failed(x[pos].nq(home,val)) ? ES_FAILED : ES_OK;
}
};
void branchB(Home home, const IntVarArgs& x) {
if (home.failed()) return;
ViewArray<Int::IntView> y(home,x);
BranchB::post(home,y);
}
// Minimal Space ///////////////////////////////////////
class TestSpace : public Space {
protected:
IntVarArray x;
public:
TestSpace(int size)
: x(*this, size, 0, 10) {
branchA(*this, x);
branchB(*this, x);
}
TestSpace (bool share, TestSpace& s)
: Space(share, s) {
x.update(*this, share, s.x);
}
virtual Space* copy (bool share) {
return new TestSpace(share, *this);
}
void print(std::ostream& os) {
os << "x= " << x << endl;
}
};
// Minimal Main //////////////////////:
int main (int, char**) {
// create model and search engine
TestSpace* m = new TestSpace(10);
DFS<TestSpace> e(m);
delete m;
// search and print all solutions
while (TestSpace* s = e.next()) {
s->print(cout); delete s;
}
return 0;
}
In this example, the status of the brancher A return true if the next variable to assign is on an even index and if the variable can take the value of 1 (false else). And the brancher B status return true if the next variable to assign is on an odd index and if the variable can take the value of 2 (false else).
With that code I expected to get the solutions [1, 2, 1, 2, ...] and [!1, !2, !1, !2, ...] (and others combinations like [!1, 2, 1, !2, ...]) but since the branchers are disposed when their status return false, only the two first variables have been assigned.
Is there a good way to make the brancher not being disposed after its status return false (or to alternate two differents branching strategies) or should I merge the two branchers into one ?
If it may help someone, here is the solution I used.
As advised by Patrick Trentin, I unified the control by making a third brancher which is a vector of branchers. Here is the implementation I used:
The header branchAllInOne.h:
#include <gecode/minimodel.hh>
using namespace Gecode;
using namespace std;
class BranchAllInOne : public Brancher {
protected:
// Queue of brancher (may be better with ActorLink)
vector<Actor *> queue;
// Every brancher are in the brancher
BrancherGroup group;
mutable int toChoose;
class ChoiceAndID : public Choice {
public:
// Choice of the brancher used
Choice* c;
/// ID of brancher used
unsigned int id;
ChoiceAndID(const Brancher& b, Choice * c, unsigned int id);
virtual ~ChoiceAndID();
virtual size_t size(void) const ;
virtual void archive(Archive& e) const ;
};
public:
BranchAllInOne(Home home);
virtual size_t dispose(Space& home);
BranchAllInOne(Home home, bool share, BranchAllInOne& b);
virtual ~BranchAllInOne();
/**
* Check status of brancher, set toChoose value to the ID of the first
* brancher with alternative left
**/
virtual bool status(const Space&) const ;
/**
* Let the brancher of ID toChoose make the choice
*/
virtual Choice* choice(Space&);
virtual Choice* choice(const Space&, Archive& e);
/**
* Let the brancher of ID toChoose commit his choice
*/
virtual ExecStatus commit(Space& home, const Choice& _c, unsigned int a);
/// Copy brancher
virtual Actor* copy(Space& home, bool share);
/// Post brancher
static BranchAllInOne * post(Home home);
virtual void print(const Space& home,
const Choice& c,
unsigned int a,
ostream& o) const ;
void pushBrancher(Space& home, Brancher *b);
};
BranchAllInOne * branchAllInOne(Home home);
The implementation branchAllInOne.cpp:
#include "branchAllInOne.h"
static Brancher * ActorToBrancher(Actor *a);
// Choice implementation
BranchAllInOne::ChoiceAndID::ChoiceAndID(const Brancher& b, Choice * c0, unsigned int id0)
: Choice(b, c0->alternatives()),
c(c0),
id(id0){}
BranchAllInOne::ChoiceAndID::~ChoiceAndID() {
delete c;
}
size_t BranchAllInOne::ChoiceAndID::size(void) const {
return sizeof(*this) + c->size();
}
void BranchAllInOne::ChoiceAndID::archive(Archive& e) const {
Choice::archive(e);
c->archive(e);
}
BranchAllInOne::BranchAllInOne(Home home)
: Brancher(home),
toChoose(-1) {
home.notice(*this,AP_DISPOSE);
}
// brancher
BranchAllInOne * BranchAllInOne::post(Home home) {
return new (home) BranchAllInOne(home);
}
size_t BranchAllInOne::dispose(Space& home) {
home.ignore(*this, AP_DISPOSE);
size_t size = queue.size() * sizeof(Actor*);
for (unsigned int i = queue.size() ; i--;) {
size += ActorToBrancher(queue[i])->dispose(home);
}
queue.~vector();
// Making sure to kill each brancher inserted in the queue (may be useless)
group.kill(home);
(void) Brancher::dispose(home);
return sizeof(*this) + size;
}
BranchAllInOne::BranchAllInOne(Home home, bool share, BranchAllInOne& b)
: Brancher(home, share, b),
queue(b.queue.size()),
toChoose(b.toChoose){
for (unsigned int i = 0 ; i < queue.size() ; i++)
queue[i] = b.queue[i]->copy(home, share);
}
BranchAllInOne::~BranchAllInOne() {
for (unsigned int i = 0 ; i < queue.size() ; i++) {
delete queue[i];
}
queue.~vector();
}
Actor* BranchAllInOne::copy(Space& home, bool share){
return new (home) BranchAllInOne(home, share, *this);
}
// status
bool BranchAllInOne::status(const Space& s) const {
for (unsigned int i = 0 ; i < queue.size() ; i++) {
if (ActorToBrancher(queue[i])->status(s)) {
toChoose = i;
return true;
}
}
std::cout << std::endl;
return false;
}
// choice
Choice* BranchAllInOne::choice(Space& s) {
ChoiceAndID* res = new ChoiceAndID(*this,
const_cast<Choice *>(ActorToBrancher(queue[toChoose])->choice(s)),
toChoose);
toChoose = -1;
return res;
}
Choice* BranchAllInOne::choice(const Space& s, Archive& e) {
return new ChoiceAndID(*this,
const_cast<Choice *>(ActorToBrancher(queue[toChoose])->choice(s, e)),
toChoose);
}
// Perform commit for choice \a _c and alternative \a a
ExecStatus BranchAllInOne::commit(Space& home, const Choice& c, unsigned int a) {
const BranchAllInOne::ChoiceAndID& ch = static_cast<const BranchAllInOne::ChoiceAndID&>(c);
return ActorToBrancher(queue[ch.id])->commit(home, const_cast<Choice&>(*ch.c), a);
}
void BranchAllInOne::print(const Space& home,
const Choice& c,
unsigned int a,
ostream& o) const {
const BranchAllInOne::ChoiceAndID& ch = static_cast<const BranchAllInOne::ChoiceAndID&>(c);
o << ch.id << ": ";
ActorToBrancher(queue[ch.id])->print(home, *(ch.c), a, o);
}
void BranchAllInOne::pushBrancher(Space &home, Brancher *b) {
queue.push_back(b);
group.move(home, *b);
}
static Brancher * ActorToBrancher(Actor *a) {
return dynamic_cast<Brancher *>(a);
}
// end of BranchAllInOne implementation
BranchAllInOne* branchAllInOne(Home home) {
if (home.failed()) return NULL;
return BranchAllInOne::post(home);
}
I've made some modifications to get a pointer to branchers I want to put in the vector (that include the post function of each branchers):
brancherA example:
BranchA * BranchA::post(Home home, ViewArray<Int::IntView>& x) {
return new (home) BranchA(home,x);
}
BranchA * branchA(Home home, const IntVarArgs& x) {
if (home.failed()) return NULL;
ViewArray<Int::IntView> y(home,x);
return BranchA::post(home,y);
}
The space has also been modified:
TestSpace::TestSpace(int size)
: x(*this, size, 0, 10) {
BranchAllInOne * b = branchAllInOne(*this);
b->pushBrancher(*this, branchA(*this, x));
b->pushBrancher(*this, branchB(*this, x));
}
I tested it with and without Gist and only got a memory leak of a pointer for each brancher put in the vector (here only two). A small problem remain is that branchers put in the vector are also scheduled after the third brancher stoped (but their status return false).

Making a timer that executes a function after a certain amount of time in milliseconds

Let's say I have this function:
void changeMap(Player* player, int map) {
player->setMap(map);
}
And I want a timer class that enables me to run that function after a certain amount of time, Something like this.
Player* chr;
int mapid = 300;
int milliseconds = 6000;
Timer.Schedule(changeMap(chr, 300), milliseconds);
Thanks in advance.
If this is a game loop then one way is to keep of list of events that you want to happen some time in the future where you store a time and a pointer to the function you want to call. (Or a std::function, or whatever). Keep the list sorted by time so the soonest event is a the top of the list.
Then in your main game loop, every loop, check the top of the list to see if the time of that event has been reached yet and if it has pop the event and call the function.
You can achieve the desired effect by the liberal use of Functor delegate objects and templates:
CAlarm.h
#ifndef CALARM_H
#define CALARM_H
#include "ADTtime.h"
#include "CStopwatch.h"
template<class FunctionObject>
class Alarm : public StopWatch {
public:
Alarm(const FunctionObject& fn);
Alarm(double tickTime, const FunctionObject& fn);
virtual ~Alarm();
FunctionObject Tick();
protected:
FunctionObject _delegate;
double _tickTime;
private:
};
template<class FunctionObject>
Alarm<FunctionObject>::Alarm(const FunctionObject& fn)
: StopWatch(), _delegate(fn), _tickTime(1.0) { }
template<class FunctionObject>
Alarm<FunctionObject>::Alarm(double tickTime, const FunctionObject& fn)
: StopWatch(), _delegate(fn), _tickTime(tickTime) { }
template<class FunctionObject>
Alarm<FunctionObject>::~Alarm() {
if(_isRunning) Stop();
}
template<class FunctionObject>
FunctionObject Alarm<FunctionObject>::Tick() {
if(IsRunning() == false) return _delegate;
if(GetElapsedTimeInSeconds() >= _tickTime) {
Reset();
_delegate();
}
return _delegate;
}
#endif
CStopwatch.h
#ifndef CSTOPWATCH_H
#define CSTOPWATCH_H
#include "ADTtime.h"
class StopWatch : public ADTTime {
public:
StopWatch();
virtual ~StopWatch();
void Start();
void Restart();
void Stop();
void Reset();
virtual void CalculateElapsedTime();
virtual double GetElapsedTimeInSeconds();
virtual double GetElapsedTimeInMilliseconds();
protected:
private:
};
#endif
CStopwatch.cpp
#include "CStopwatch.h"
StopWatch::StopWatch() : ADTTime() {
/* DO NOTHING. ALL INITIALIZATION HAPPENS IN BASE CLASS */
}
StopWatch::~StopWatch() {
_startTime = -1;
_endTime = -1;
_deltaTime = -1.0;
_isRunning = false;
}
void StopWatch::Start() {
if(_isRunning == true) return;
_startTime = clock();
_isRunning = true;
}
void StopWatch::Stop() {
if(_isRunning == false) return;
_isRunning = false;
CalculateElapsedTime();
}
void StopWatch::Restart() {
Reset();
Start();
}
void StopWatch::Reset() {
Stop();
_startTime = 0;
_endTime = 0;
_deltaTime = 0.0;
}
void StopWatch::CalculateElapsedTime() {
_endTime = clock();
_deltaTime = difftime(_startTime, _endTime);
}
double StopWatch::GetElapsedTimeInSeconds() {
CalculateElapsedTime();
return -ADTTime::GetElapsedTimeInSeconds();
}
double StopWatch::GetElapsedTimeInMilliseconds() {
CalculateElapsedTime();
return -ADTTime::GetElapsedTimeInMilliseconds();
}
ADTTime.h
#ifndef ADTTIME_H
#define ADTTIME_H
#include <ctime>
class ADTTime {
public:
clock_t GetStartTime() const;
clock_t GetStartTime();
double GetStartTimeInSeconds() const;
double GetStartTimeInSeconds();
clock_t GetEndTime() const;
clock_t GetEndTime();
double GetEndTimeInSeconds() const;
double GetEndTimeInSeconds();
virtual double GetElapsedTimeInSeconds();
virtual double GetElapsedTimeInMilliseconds();
virtual void CalculateElapsedTime()=0;
bool IsRunning() const;
bool IsRunning();
virtual void Start()=0;
virtual void Restart()=0;
virtual void Stop()=0;
virtual void Reset()=0;
ADTTime();
virtual ~ADTTime();
protected:
bool _isRunning;
clock_t _startTime;
clock_t _endTime;
double _deltaTime;
private:
};
#endif
CADTTime.cpp
#include "ADTtime.h"
clock_t ADTTime::GetStartTime() const {
return _startTime;
}
clock_t ADTTime::GetStartTime() {
return static_cast<const ADTTime&>(*this).GetStartTime();
}
double ADTTime::GetStartTimeInSeconds() const {
return static_cast<double>((_startTime / CLOCKS_PER_SEC));
}
double ADTTime::GetStartTimeInSeconds() {
return static_cast<const ADTTime&>(*this).GetStartTimeInSeconds();
}
clock_t ADTTime::GetEndTime() const {
return _endTime;
}
clock_t ADTTime::GetEndTime() {
return static_cast<const ADTTime&>(*this).GetEndTime();
}
double ADTTime::GetEndTimeInSeconds() const {
return static_cast<double>((_endTime / CLOCKS_PER_SEC));
}
double ADTTime::GetEndTimeInSeconds() {
return static_cast<const ADTTime&>(*this).GetEndTimeInSeconds();
}
double ADTTime::GetElapsedTimeInSeconds() {
return _deltaTime / CLOCKS_PER_SEC;
}
double ADTTime::GetElapsedTimeInMilliseconds() {
return _deltaTime;
}
bool ADTTime::IsRunning() const {
return _isRunning;
}
bool ADTTime::IsRunning() {
return static_cast<const ADTTime&>(*this).IsRunning();
}
ADTTime::ADTTime() : _isRunning(false), _startTime(-1), _endTime(-1), _deltaTime(-1.0) { }
ADTTime::~ADTTime() {
_isRunning = false;
_startTime = -1;
_endTime = -1;
_deltaTime = -1.0;
}
Since you are running on Windows OS, I don't understand why are you reinventing the wheel?
CComPtr<IReferenceClock> pReferenceClock;
HRESULT hr = CoCreateInstance( CLSID_SystemClock, NULL, CLSCTX_INPROC_SERVER, IID_IReferenceClock, (void**)&pReferenceClock );
hr = pReferenceClock->AdviseTime( ... );
// or, hr = pReferenceClock->AdvisePeriodic( ... );
and once you are done,
hr = pReferenceClock->Unadvise( adviseCookie );
You can implement a simple (perhaps a bit rough around the edges) function that fire off a one-off event, like a timer, after a specified amount of milliseconds, using std::thread and std::chrono facilities
Something like that:
void doAfter( const std::function<void(void)>& f,
size_t intervalMs )
{
std::thread t{[f, intervalMs] () -> void
{
auto chronoInterval = std::chrono::milliseconds( intervalMs );
std::this_thread::sleep_for( chronoInterval );
f();
}
};
// You can either `t.detach()` the thread, or wait to `join` it in main
}

Callback to class member

I am trying to build a very simple scheduler. It allows tasks (functions) to be added to a list and run on set intervals. The 'Scheduler' class works fine if I provide a static function as an argument to its 'ScheduleTask' member.
class TestController
{
private:
Scheduler _scheduler;
public:
TestController(void)
{
_scheduler.ScheduleTask(Task1, 3000);
_scheduler.ScheduleTask(Task2, 5000);
}
~TestController(void);
void Task1(void) { }
void Task2(void) { }
};
struct Task
{
long interval;
long last_run;
void (*TaskCallback) (void);
Task()
{
last_run = 0;
}
};
class Scheduler
{
private:
std::vector<Task> _tasks;
public:
Scheduler(void) { }
~Scheduler(void) { }
void ScheduleTask(void (*TaskCallback) (void), long interval)
{
Task t;
t.TaskCallback = TaskCallback;
t.interval = interval;
_tasks.push_back(t);
}
void loop()
{
for(unsigned int i = 0; i < _tasks.size(); i++)
{
long elapsed = clock();
if(elapsed - _tasks[i].last_run >= _tasks[i].interval)
{
_tasks[i].last_run = elapsed;
_tasks[i].TaskCallback();
}
}
}
};
How can I modify the callback to accept the member on the already instantiated 'TestController' object?
Use a combination of boost::function and boost::bind. Alternatively, use std::function and std::bind if your compiler supports them.
#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <vector>
typedef boost::function<void()> Callback;
struct Task
{
long interval;
long last_run;
Callback TaskCallback;
Task()
{
last_run = 0;
}
};
class Scheduler
{
private:
std::vector<Task> _tasks;
public:
Scheduler(void) { }
~Scheduler(void) { }
void ScheduleTask(const Callback& TaskCallback, long interval)
{
Task t;
t.TaskCallback = TaskCallback;
t.interval = interval;
_tasks.push_back(t);
}
void loop()
{
for(unsigned int i = 0; i < _tasks.size(); i++)
{
long elapsed = clock();
if(elapsed - _tasks[i].last_run >= _tasks[i].interval)
{
_tasks[i].last_run = elapsed;
_tasks[i].TaskCallback();
}
}
}
};
class TestController
{
private:
Scheduler _scheduler;
public:
TestController(void)
{
_scheduler.ScheduleTask(boost::bind(&TestController::Task1,this), 3000);
_scheduler.ScheduleTask(boost::bind(&TestController::Task2,this), 5000);
}
~TestController(void);
void Task1(void) { }
void Task2(void) { }
};