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Copy pathVariantTests.cpp
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Copy pathVariantTests.cpp
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497 lines (457 loc) · 15.6 KB
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#include <benchmark/benchmark.h>
#include <iostream>
#include <stdexcept>
#include <variant>
#include <vector>
namespace helper {
template<class... Ts> struct overload : Ts... { using Ts::operator()...; };
template<class... Ts> overload(Ts...) -> overload<Ts...>; // no need in C++20, MSVC?
}
namespace state {
struct Idle { };
struct AmountEntered { int amount{ 0 }; int availableChange{ 0 }; };
struct ItemSelected { std::string item; int availableChange{ 0 }; };
struct ChangeDispensed { int change{ 0 }; };
struct Dummy { int a; int b; };
struct Dummy2 { int a; double b; };
struct Dummy3 { int a; float b; };
struct Dummy4 { int a; char b; };
}
struct VendingState : std::variant<state::Idle, state::AmountEntered, state::ItemSelected, state::ChangeDispensed, state::Dummy, state::Dummy2, state::Dummy3, state::Dummy4>
{
using variant::variant;
};
namespace event {
struct EnterAmount { int amount{ 0 }; };
struct SelectItem { std::string item; };
struct DispenseChange { };
struct Reset { };
struct Dummy { int a; int b; };
struct Dummy2 { int a; double b; };
struct Dummy3 { int a; float b; };
struct Dummy4 { int a; char b; };
}
using PossibleEvent = std::variant<event::EnterAmount, event::SelectItem, event::DispenseChange, event::Reset, event::Dummy, event::Dummy2, event::Dummy3, event::Dummy4>;
struct Item { std::string name; unsigned quantity{ 0 }; int price{ 0 }; };
class VendingMachine {
public:
void Reset() {
state_ = state::Idle{ };
registry_ = {
Item {"Coke", 5, 50},
Item {"Pepsi", 3, 45},
Item {"Water", 4, 35},
Item {"Snack", 5, 25}
};
}
void processEvent(const PossibleEvent& event) {
state_ = std::visit(helper::overload{
[this](const auto& state, const auto& evt) {
return onEvent(state, evt);
}
}, state_, event);
}
void processEventGet(const PossibleEvent& event) {
if (auto enterAmountEvent = std::get_if<event::EnterAmount>(&event)) {
if (auto idleState = std::get_if<state::Idle>(&state_)) {
state_ = onEvent(*idleState, *enterAmountEvent);
}
else if (auto amountEnteredState = std::get_if<state::AmountEntered>(&state_)) {
state_ = onEvent(*amountEnteredState, *enterAmountEvent);
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (auto selectItemEvent = std::get_if<event::SelectItem>(&event)) {
if (auto amountEnteredState = std::get_if<state::AmountEntered>(&state_)) {
state_ = onEvent(*amountEnteredState, *selectItemEvent);
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (auto dispenseChangeEvent = std::get_if<event::DispenseChange>(&event)) {
if (auto itemSelectedState = std::get_if<state::ItemSelected>(&state_)) {
state_ = onEvent(*itemSelectedState, *dispenseChangeEvent);
}
else if (auto amoundEntered = std::get_if<state::AmountEntered>(&state_)) {
state_ = onEvent(*amoundEntered, *dispenseChangeEvent);
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (auto resetEvent = std::get_if<event::Reset>(&event)) {
if (auto changeDispensedState = std::get_if<state::ChangeDispensed>(&state_)) {
state_ = onEvent(*changeDispensedState, *resetEvent);
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else {
throw std::logic_error{ "Unsupported event type" };
}
}
void processEventGetInline(const PossibleEvent& event) {
if (auto enterAmountEvent = std::get_if<event::EnterAmount>(&event)) {
if (auto idleState = std::get_if<state::Idle>(&state_)) {
state_ = state::AmountEntered{ enterAmountEvent->amount, enterAmountEvent->amount };
}
else if (auto amountEnteredState = std::get_if<state::AmountEntered>(&state_)) {
state_ = state::AmountEntered{ amountEnteredState->amount + enterAmountEvent->amount, amountEnteredState->availableChange + enterAmountEvent->amount };
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (auto selectItemEvent = std::get_if<event::SelectItem>(&event)) {
if (auto amountEnteredState = std::get_if<state::AmountEntered>(&state_)) {
auto it = std::ranges::find(registry_, selectItemEvent->item, &Item::name);
if (it != registry_.end() && it->quantity > 0 && it->price <= amountEnteredState->amount)
{
--(it->quantity);
state_ = state::ItemSelected{ selectItemEvent->item, amountEnteredState->availableChange - it->price };
}
else {
state_ = *amountEnteredState;
}
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (auto dispenseChangeEvent = std::get_if<event::DispenseChange>(&event)) {
if (auto itemSelectedState = std::get_if<state::ItemSelected>(&state_)) {
state_ = state::ChangeDispensed{ itemSelectedState->availableChange };
}
else if (auto amoundEntered = std::get_if<state::AmountEntered>(&state_)) {
state_ = state::Idle{ };
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (auto resetEvent = std::get_if<event::Reset>(&event)) {
if (auto changeDispensedState = std::get_if<state::ChangeDispensed>(&state_)) {
state_ = state::Idle{ };
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else {
throw std::logic_error{ "Unsupported event type" };
}
}
void processEventHoldAlternative(const PossibleEvent& event) {
if (std::holds_alternative<event::EnterAmount>(event)) {
auto& enterAmountEvent = std::get<event::EnterAmount>(event);
if (std::holds_alternative<state::Idle>(state_)) {
auto& idleState = std::get<state::Idle>(state_);
state_ = state::AmountEntered{ enterAmountEvent.amount, enterAmountEvent.amount };
}
else if (std::holds_alternative<state::AmountEntered>(state_)) {
auto& amountEnteredState = std::get<state::AmountEntered>(state_);
state_ = state::AmountEntered{ amountEnteredState.amount + enterAmountEvent.amount, amountEnteredState.availableChange + enterAmountEvent.amount };
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (std::holds_alternative<event::SelectItem>(event)) {
auto& selectItemEvent = std::get<event::SelectItem>(event);
if (std::holds_alternative<state::AmountEntered>(state_)) {
auto& amountEnteredState = std::get<state::AmountEntered>(state_);
auto it = std::ranges::find(registry_, selectItemEvent.item, &Item::name);
if (it != registry_.end() && it->quantity > 0 && it->price <= amountEnteredState.amount)
{
--(it->quantity);
state_ = state::ItemSelected{ selectItemEvent.item, amountEnteredState.availableChange - it->price };
}
else {
state_ = amountEnteredState;
}
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (std::holds_alternative<event::DispenseChange>(event)) {
if (std::holds_alternative<state::ItemSelected>(state_)) {
auto& itemSelectedState = std::get<state::ItemSelected>(state_);
state_ = state::ChangeDispensed{ itemSelectedState.availableChange };
}
else if (std::holds_alternative<state::AmountEntered>(state_)) {
state_ = state::Idle{ };
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else if (std::holds_alternative<event::Reset>(event)) {
if (std::holds_alternative<state::ChangeDispensed>(state_)) {
state_ = state::Idle{ };
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
}
else {
throw std::logic_error{ "Unsupported event type" };
}
}
VendingState onEvent(const state::Idle& idle, const event::EnterAmount& amount) {
//std::cout << std::format("Idle -> EnterAmount: {}\n", amount.amount);
return state::AmountEntered{ amount.amount, amount.amount };
}
VendingState onEvent(const state::AmountEntered& current, const event::EnterAmount& amount) {
//std::cout << std::format("AmountEntered {} -> EnterAmount: {}\n", current.amount, amount.amount);
return state::AmountEntered{ current.amount + amount.amount, current.availableChange + amount.amount };
}
VendingState onEvent(const state::AmountEntered& amountEntered, const event::SelectItem& item) {
//std::cout << std::format("AmountEntered {} -> SelectItem: {}\n", amountEntered.amount, item.item);
auto it = std::ranges::find(registry_, item.item, &Item::name);
if (it != registry_.end() && it->quantity > 0 && it->price <= amountEntered.amount)
{
--(it->quantity);
return state::ItemSelected{ item.item, amountEntered.availableChange - it->price };
}
return amountEntered;
}
VendingState onEvent(const state::ItemSelected& itemSelected, const event::DispenseChange& change) {
//std::cout << std::format("ItemSelected -> DispenseChange {}\n", itemSelected.availableChange);
return state::ChangeDispensed{ itemSelected.availableChange };
}
VendingState onEvent(const state::ChangeDispensed& changeDispensed, const event::Reset& reset) {
//std::cout << "ChangeDispensed -> Reset\n";
return state::Idle{ };
}
VendingState onEvent(const state::AmountEntered& emountEntered, const event::DispenseChange& change) {
//std::cout << "AmountEntered -> Dispense\n";
return state::Idle{ };
}
VendingState onEvent(const state::AmountEntered& emountEntered, const event::Reset& reset) {
//std::cout << "AmountEntered -> Reset\n";
return state::Idle{ };
}
VendingState onEvent(const auto&, const auto&) {
throw std::logic_error{ "Unsupported event transition" };
}
private:
std::vector<Item> registry_{
Item {"Coke", 5, 50},
Item {"Pepsi", 3, 45},
Item {"Water", 4, 35},
Item {"Snack", 5, 25}
};
VendingState state_;
};
enum class EnumState {
Idle,
AmountEntered,
ItemSelected,
ChangeDispensed
};
enum class EnumEvent {
EnterAmount,
SelectItem,
DispenseChange,
Reset
};
class EnumVendingMachine {
public:
void Reset() {
state_ = EnumState::Idle;
registry_ = {
Item {"Coke", 5, 50},
Item {"Pepsi", 3, 45},
Item {"Water", 4, 35},
Item {"Snack", 5, 25}
};
availableChange_ = 0;
}
void processEvent(EnumEvent event, const std::string& item = "", int amount = 0) {
switch (state_) {
case EnumState::Idle: {
if (event == EnumEvent::EnterAmount) {
availableChange_ += amount;
state_ = EnumState::AmountEntered;
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
break;
}
case EnumState::AmountEntered: {
switch (event) {
case EnumEvent::EnterAmount: {
availableChange_ += amount;
break;
}
case EnumEvent::SelectItem: {
auto it = std::find_if(registry_.begin(), registry_.end(),
[&item](const Item& i) { return i.name == item; });
if (it != registry_.end() && it->quantity > 0 && it->price <= availableChange_) {
--(it->quantity);
availableChange_ -= it->price;
state_ = EnumState::ItemSelected;
}
else {
throw std::logic_error{ "Item not available or insufficient amount entered" };
}
break;
}
case EnumEvent::DispenseChange: {
state_ = EnumState::Idle;
break;
}
default: {
throw std::logic_error{ "Unsupported event transition" };
}
}
break;
}
case EnumState::ItemSelected: {
if (event == EnumEvent::DispenseChange) {
state_ = EnumState::ChangeDispensed;
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
break;
}
case EnumState::ChangeDispensed: {
if (event == EnumEvent::Reset) {
state_ = EnumState::Idle;
}
else {
throw std::logic_error{ "Unsupported event transition" };
}
break;
}
}
}
private:
std::vector<Item> registry_{
Item {"Coke", 5, 50},
Item {"Pepsi", 3, 45},
Item {"Water", 4, 35},
Item {"Snack", 5, 25}
};
EnumState state_{ EnumState::Idle };
int availableChange_{ 0 };
};
constexpr int RUNS = 10000;
static void VisitVersion(benchmark::State& state) {
VendingMachine vm;
// Code inside this loop is measured repeatedly
for (auto _ : state) {
vm.Reset();
for (int i = 0; i < RUNS; ++i)
{
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::DispenseChange {});
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::DispenseChange {});
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::EnterAmount { 30 });
}
vm.processEvent(event::SelectItem { "Coke" });
vm.processEvent(event::DispenseChange {});
vm.processEvent(event::Reset { });
}
}
// Register the function as a benchmark
BENCHMARK(VisitVersion);
static void GetIfVersion(benchmark::State& state) {
VendingMachine vm;
// Code inside this loop is measured repeatedly
for (auto _ : state) {
vm.Reset();
for (int i = 0; i < RUNS; ++i)
{
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::DispenseChange {});
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::DispenseChange {});
vm.processEventGet(event::EnterAmount { 30 });
vm.processEventGet(event::EnterAmount { 30 });
}
vm.processEventGet(event::SelectItem { "Coke" });
vm.processEventGet(event::DispenseChange {});
vm.processEventGet(event::Reset { });
}
}
// Register the function as a benchmark
BENCHMARK(GetIfVersion);
static void GetIfInlineVersion(benchmark::State& state) {
VendingMachine vm;
// Code inside this loop is measured repeatedly
for (auto _ : state) {
vm.Reset();
for (int i = 0; i < RUNS; ++i)
{
vm.processEventGetInline(event::EnterAmount { 30 });
vm.processEventGetInline(event::DispenseChange {});
vm.processEventGetInline(event::EnterAmount { 30 });
vm.processEventGetInline(event::EnterAmount { 30 });
vm.processEventGetInline(event::DispenseChange {});
vm.processEventGetInline(event::EnterAmount { 30 });
vm.processEventGetInline(event::EnterAmount { 30 });
}
vm.processEventGetInline(event::SelectItem { "Coke" });
vm.processEventGetInline(event::DispenseChange {});
vm.processEventGetInline(event::Reset { });
}
}
// Register the function as a benchmark
BENCHMARK(GetIfInlineVersion);
static void GetIfHoldsAlternativeVersion(benchmark::State& state) {
VendingMachine vm;
// Code inside this loop is measured repeatedly
for (auto _ : state) {
vm.Reset();
for (int i = 0; i < RUNS; ++i)
{
vm.processEventHoldAlternative(event::EnterAmount { 30 });
vm.processEventHoldAlternative(event::DispenseChange {});
vm.processEventHoldAlternative(event::EnterAmount { 30 });
vm.processEventHoldAlternative(event::EnterAmount { 30 });
vm.processEventHoldAlternative(event::DispenseChange {});
vm.processEventHoldAlternative(event::EnterAmount { 30 });
vm.processEventHoldAlternative(event::EnterAmount { 30 });
}
vm.processEventHoldAlternative(event::SelectItem { "Coke" });
vm.processEventHoldAlternative(event::DispenseChange {});
vm.processEventHoldAlternative(event::Reset { });
}
}
// Register the function as a benchmark
BENCHMARK(GetIfHoldsAlternativeVersion);
static void EnumVersion(benchmark::State& state) {
EnumVendingMachine vm;
// Code inside this loop is measured repeatedly
for (auto _ : state) {
vm.Reset();
for (int i = 0; i < RUNS; ++i)
{
vm.processEvent(EnumEvent::EnterAmount, "", 30);
vm.processEvent(EnumEvent::DispenseChange);
vm.processEvent(EnumEvent::EnterAmount, "", 30);
vm.processEvent(EnumEvent::EnterAmount, "", 30);
vm.processEvent(EnumEvent::DispenseChange);
vm.processEvent(EnumEvent::EnterAmount, "", 30);
vm.processEvent(EnumEvent::EnterAmount, "", 30);
}
vm.processEvent(EnumEvent::SelectItem, "Coke");
vm.processEvent(EnumEvent::DispenseChange);
vm.processEvent(EnumEvent::Reset);
}
}
// Register the function as a benchmark
BENCHMARK(EnumVersion);
BENCHMARK_MAIN();
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