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#pragma once
#include <vector>
#include <functional>
#include <assert.h>
#include "gui/Widget.hpp"
template <typename T>
struct SafeVectorItem {
T item;
bool alive = false;
};
// A vector that can be modified while iterating
template <typename T>
class SafeVector {
public:
using PointerType = typename std::pointer_traits<T>::element_type*;
SafeVector() = default;
SafeVector(const SafeVector&) = delete;
SafeVector& operator=(const SafeVector&) = delete;
~SafeVector() {
clear();
}
void push_back(T item) {
data.push_back({std::move(item), true});
++num_items_alive;
}
// Safe to call when vector is empty
// TODO: Make this iterator safe
void pop_back() {
if(!data.empty()) {
gsr::add_widget_to_remove(std::move(data.back().item));
data.pop_back();
--num_items_alive;
}
}
// Might not remove the data immediately if inside for_each loop.
// In that case the item is removed at the end of the loop.
void remove(PointerType item_to_remove) {
if(for_each_depth == 0) {
remove_item(item_to_remove);
return;
}
SafeVectorItem<T> *item = get_item(item_to_remove);
if(item && item->alive) {
item->alive = false;
--num_items_alive;
has_items_to_remove = true;
}
}
// Safe to call when vector is empty, in which case it returns nullptr
T* back() {
for(auto it = data.rbegin(), end = data.rend(); it != end; ++it) {
if(it->alive)
return &it->item;
}
return nullptr;
}
// TODO: Make this iterator safe
void clear() {
for(auto &item : data) {
gsr::add_widget_to_remove(std::move(item.item));
}
data.clear();
num_items_alive = 0;
}
// Return true from |callback| to continue. This function returns false if |callback| returned false
bool for_each(std::function<bool(T &t)> callback, bool include_dead = false) {
bool result = true;
++for_each_depth;
for(size_t i = 0; i < data.size(); ++i) {
if(data[i].alive || include_dead) {
result = callback(data[i].item);
if(!result)
break;
}
}
--for_each_depth;
if(for_each_depth == 0)
remove_dead_items();
return result;
}
// Return true from |callback| to continue. This function returns false if |callback| returned false
bool for_each_reverse(std::function<bool(T &t)> callback, bool include_dead = false) {
bool result = true;
++for_each_depth;
int i = (int)data.size() - 1;
while(true) {
// pop_back can be called while iterating so handle that case
if(i >= (int)data.size())
i = (int)data.size() - 1;
if(i < 0)
break;
if(data[i].alive || include_dead) {
result = callback(data[i].item);
if(!result)
break;
}
--i;
}
--for_each_depth;
if(for_each_depth == 0)
remove_dead_items();
return result;
}
T& operator[](size_t index) {
assert(index < data.size());
return data[index].item;
}
const T& operator[](size_t index) const {
assert(index < data.size());
return data[index].item;
}
size_t size() const {
return (size_t)num_items_alive;
}
bool empty() const {
return num_items_alive == 0;
}
void replace_item(PointerType item_to_replace, T new_item) {
SafeVectorItem<T> *item = get_item(item_to_replace);
if(item->alive) {
gsr::add_widget_to_remove(std::move(item->item));
item->item = std::move(new_item);
}
}
private:
void remove_item(PointerType item_to_remove) {
for(auto it = data.begin(), end = data.end(); it != end; ++it) {
if(&*(it->item) == item_to_remove) {
gsr::add_widget_to_remove(std::move(it->item));
data.erase(it);
--num_items_alive;
return;
}
}
}
SafeVectorItem<T>* get_item(PointerType item_to_remove) {
for(auto &item : data) {
if(&*(item.item) == item_to_remove)
return &item;
}
return nullptr;
}
void remove_dead_items() {
if(!has_items_to_remove)
return;
for(auto it = data.begin(); it != data.end();) {
if(it->alive) {
++it;
} else {
gsr::add_widget_to_remove(std::move(it->item));
it = data.erase(it);
}
}
has_items_to_remove = false;
}
private:
std::vector<SafeVectorItem<T>> data;
int for_each_depth = 0;
int num_items_alive = 0;
bool has_items_to_remove = false;
};
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