昨天中午北京温度为40度，在中午12：16分我来到篮球场，思考了1分钟决定开站
转球：
我和另外3名队友开始半场，
球传到我手的刹那顿时烫的我持球不稳，顿时问道了淡淡的胶皮味道和烤肉味道的混搭。
这时我来了一个腾空跳投，
球---------爆炸了。。。。。。。。
听新闻说昨天在路上都是 “熟人”
一位老大爷不慎被车刮倒了，大爷二话没说立马爬了起来，围观众人议论纷纷：
“大爷人不错”，“大爷素质真高”，“大爷身体可真好”
大爷说：
“快拉 秦皇岛吧，烫腚”。
估计昨天又有不少沿街乞讨人士和流浪狗失去生命（咋没人管管）
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在做Cocos2d-x2.0人的人们估计正在使用CCArray,CCDirectionary,CCDouble,CCFloat这些正搞得很爽，但不得不说
它们在V3.0中不用了。
看下3.0中的数据结合类Vector,Map,Value(建议大家自行阅读源码，本文只介绍如何使用,关于引用计数的概念推荐大家看我的视频)，
以下案例来自TestCpp:
void TemplateVectorTest::onEnter()
{
UnitTestDemo::onEnter();
Vector<Node*> vec;//定义一个向量，其实是对stl Vector的封装，只是加入了对象的内存计数管理
CCASSERT(vec.empty(), "");
CCASSERT(vec.capacity() == 0, "");
CCASSERT(vec.size() == 0, "");
CCASSERT(vec.max_size() > 0, "");
auto node1 = Node::create();
node1->setTag(1);
vec.pushBack(node1);//在向量添加一个元素
CCASSERT(node1->getReferenceCount() == 2, "");
auto node2 = Node::create();
node2->setTag(2);
vec.pushBack(node2);//添加元素 编号会从0开始
CCASSERT(vec.getIndex(node1) == 0, "");
CCASSERT(vec.getIndex(node2) == 1, "");
auto node3 = Node::create();
node3->setTag(3);
vec.insert(1, node3); //插入元素
CCASSERT(vec.at(0)->getTag() == 1, "");
CCASSERT(vec.at(1)->getTag() == 3, "");
CCASSERT(vec.at(2)->getTag() == 2, "");
// Test copy constructor
Vector<Node*> vec2(vec); //复制一个向量
CCASSERT(vec2.size() == vec.size(), "");
ssize_t size = vec.size();
for (ssize_t i = 0; i < size; ++i)
{
CCASSERT(vec2.at(i) == vec.at(i), "");
CCASSERT(vec.at(i)->getReferenceCount() == 3, "");
CCASSERT(vec2.at(i)->getReferenceCount() == 3, "");
}
// Test copy assignment operator
Vector<Node*> vec3;
vec3 = vec2;
CCASSERT(vec3.size() == vec2.size(), "");
size = vec3.size();
for (ssize_t i = 0; i < size; ++i)
{
CCASSERT(vec3.at(i) == vec2.at(i), "");
CCASSERT(vec3.at(i)->getReferenceCount() == 4, "");
CCASSERT(vec2.at(i)->getReferenceCount() == 4, "");
CCASSERT(vec.at(i)->getReferenceCount() == 4, "");
}
// Test move constructor （Lambda 表达式，定义一个函数用于创建一个Vector,关于Lambda建议看我的视频)
auto createVector = [this](){
Vector<Node*> ret;
for (int i = 0; i < 20; i++)
{
ret.pushBack(Node::create());
}
int j = 1000;
for (auto& child : ret)
{
child->setTag(j++);
}
return ret;
};
Vector<Node*> vec4(createVector());
for (const auto& child : vec4)
{
CC_UNUSED_PARAM(child);
CCASSERT(child->getReferenceCount() == 2, "");
}
// Test init Vector<T> with capacity
Vector<Node*> vec5(10);
CCASSERT(vec5.capacity() == 10, "");
vec5.reserve(20);
CCASSERT(vec5.capacity() == 20, "");
CCASSERT(vec5.size() == 0, "");
CCASSERT(vec5.empty(), "");
auto toRemovedNode = Node::create();
vec5.pushBack(toRemovedNode);
CCASSERT(toRemovedNode->getReferenceCount() == 2, "");
// Test move assignment operator
vec5 = createVector();
CCASSERT(toRemovedNode->getReferenceCount() == 1, "");
CCASSERT(vec5.size() == 20, "size should be 20");
for (const auto& child : vec5) //这也是C++11新特性，好用吧，不像STL用迭代器那么麻烦
{
CC_UNUSED_PARAM(child);
CCASSERT(child->getReferenceCount() == 2, "");
}
// Test Vector<T>::find
CCASSERT(vec.find(node3) == (vec.begin() + 1), "");
CCASSERT(std::find(std::begin(vec), std::end(vec), node2) == (vec.begin() + 2), "");
CCASSERT(vec.front()->getTag() == 1, "");
CCASSERT(vec.back()->getTag() == 2, "");
CCASSERT(vec.getRandomObject(), "");
CCASSERT(!vec.contains(Node::create()), "");
CCASSERT(vec.contains(node1), "");
CCASSERT(vec.contains(node2), "");
CCASSERT(vec.contains(node3), "");
CCASSERT(vec.equals(vec2), "");
CCASSERT(vec.equals(vec3), "");
// Insert
vec5.insert(2, node1);
CCASSERT(vec5.at(2)->getTag() == 1, "");
CCASSERT(vec5.size() == 21, "");
vec5.back()->setTag(100);
vec5.popBack();
CCASSERT(vec5.size() == 20, "");
CCASSERT(vec5.back()->getTag() != 100, "");
// Erase and clear
Vector<Node*> vec6 = createVector();
Vector<Node*> vec7 = vec6; // Copy for check
CCASSERT(vec6.size() == 20, "");
vec6.erase(vec6.begin() + 1); //
CCASSERT(vec6.size() == 19, "");
CCASSERT((*(vec6.begin() + 1))->getTag() == 1002, "");
vec6.erase(vec6.begin() + 2, vec6.begin() + 10);
CCASSERT(vec6.size() == 11, "");
CCASSERT(vec6.at(0)->getTag() == 1000, "");
CCASSERT(vec6.at(1)->getTag() == 1002, "");
CCASSERT(vec6.at(2)->getTag() == 1011, "");
CCASSERT(vec6.at(3)->getTag() == 1012, "");
vec6.erase(3);
CCASSERT(vec6.at(3)->getTag() == 1013, "");
vec6.eraseObject(vec6.at(2));
CCASSERT(vec6.at(2)->getTag() == 1013, "");
vec6.clear();
auto objA = Node::create(); // retain count is 1
auto objB = Node::create();
auto objC = Node::create();
{
Vector<Node*> array1;
Vector<Node*> array2;
// push back objA 3 times
array1.pushBack(objA); // retain count is 2
array1.pushBack(objA); // retain count is 3
array1.pushBack(objA); // retain count is 4
array2.pushBack(objA); // retain count is 5
array2.pushBack(objB);
array2.pushBack(objC);
for (auto obj : array1) {
array2.eraseObject(obj);
}
CCASSERT(objA->getReferenceCount() == 4, "");
}
CCASSERT(objA->getReferenceCount() == 1, "");
{ //这是一个代码块，出了块引用计数会恢复，是一个AutoReleasePool
Vector<Node*> array1;
// push back objA 3 times
array1.pushBack(objA); // retain count is 2
array1.pushBack(objA); // retain count is 3
array1.pushBack(objA); // retain count is 4
CCASSERT(objA->getReferenceCount() == 4, "");
array1.eraseObject(objA, true); // Remove all occurrences in the Vector.
CCASSERT(objA->getReferenceCount() == 1, "");
array1.pushBack(objA); // retain count is 2
array1.pushBack(objA); // retain count is 3
array1.pushBack(objA); // retain count is 4
array1.eraseObject(objA, false);
CCASSERT(objA->getReferenceCount() == 3, ""); // Only remove the first occurrence in the Vector.
}
// Check the retain count in vec7
CCASSERT(vec7.size() == 20, "");
for (const auto& child : vec7)
{
CC_UNUSED_PARAM(child);
CCASSERT(child->getReferenceCount() == 2, "");
}
// Sort 排序，结合Lambda
Vector<Node*> vecForSort = createVector();
std::sort(vecForSort.begin(), vecForSort.end(), [](Node* a, Node* b){
return a->getTag() >= b->getTag();
});
for (int i = 0; i < 20; ++i)
{
CCASSERT(vecForSort.at(i)->getTag() - 1000 == (19 - i), "");
}
// Reverse
vecForSort.reverse();
for (int i = 0; i < 20; ++i)
{
CCASSERT(vecForSort.at(i)->getTag() - 1000 == i, "");
}
// Swap
Vector<Node*> vecForSwap = createVector();
vecForSwap.swap(2, 4);
CCASSERT(vecForSwap.at(2)->getTag() == 1004, "");
CCASSERT(vecForSwap.at(4)->getTag() == 1002, "");
vecForSwap.swap(vecForSwap.at(2), vecForSwap.at(4));
CCASSERT(vecForSwap.at(2)->getTag() == 1002, "");
CCASSERT(vecForSwap.at(4)->getTag() == 1004, "");
// shrinkToFit
Vector<Node*> vecForShrink = createVector();
vecForShrink.reserve(100);
CCASSERT(vecForShrink.capacity() == 100, "");
vecForShrink.pushBack(Node::create());
vecForShrink.shrinkToFit();
CCASSERT(vecForShrink.capacity() == 21, "");
// get random object
// Set the seed by time
srand((unsigned)time(nullptr));
Vector<Node*> vecForRandom = createVector();
log("<--- begin ---->");
for (int i = 0; i < vecForRandom.size(); ++i)
{
log("Vector: random object tag = %d", vecForRandom.getRandomObject()->getTag());
}
log("<---- end ---->");
// Self assignment
Vector<Node*> vecSelfAssign = createVector();
vecSelfAssign = vecSelfAssign;
CCASSERT(vecSelfAssign.size() == 20, "");
for (const auto& child : vecSelfAssign)
{
CC_UNUSED_PARAM(child);
CCASSERT(child->getReferenceCount() == 2, "");
}
vecSelfAssign = std::move(vecSelfAssign);
CCASSERT(vecSelfAssign.size() == 20, "");
for (const auto& child : vecSelfAssign)
{
CC_UNUSED_PARAM(child);
CCASSERT(child->getReferenceCount() == 2, "");
}
// const at
Vector<Node*> vecConstAt = createVector();
constFunc(vecConstAt);
}
//---------------------------以下是Map的使用-----------------------------------
void TemplateMapTest::onEnter()
{
UnitTestDemo::onEnter();
auto createMap = [this](){
Map<std::string, Node*> ret;
for (int i = 0; i < 20; ++i)
{
auto node = Node::create();
node->setTag(1000 + i);
ret.insert(StringUtils::toString(i), node);
}
return ret;
};
// Default constructor
Map<std::string, Node*> map1;
CCASSERT(map1.empty(), "");
CCASSERT(map1.size() == 0, "");
CCASSERT(map1.keys().empty(), "");
CCASSERT(map1.keys(Node::create()).empty(), "");
// Move constructor
Map<std::string, Node*> map2 = createMap();
for (const auto& e : map2)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second->getReferenceCount() == 2, "");
}
// Copy constructor
Map<std::string, Node*> map3(map2);
for (const auto& e : map3)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second->getReferenceCount() == 3, "");
}
// Move assignment operator
Map<std::string, Node*> map4;
auto unusedNode = Node::create();
map4.insert("unused",unusedNode);
map4 = createMap();
CCASSERT(unusedNode->getReferenceCount() == 1, "");
for (const auto& e : map4)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second->getReferenceCount() == 2, "");
}
// Copy assignment operator
Map<std::string, Node*> map5;
map5 = map4;
for (const auto& e : map5)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second->getReferenceCount() == 3, "");
}
// Check size
CCASSERT(map4.size() == map5.size(), "");
for (const auto& e : map4)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second == map5.find(e.first)->second, "");
}
// bucket_count, bucket_size(n), bucket
log("--------------");
log("bucket_count = %d", static_cast<int>(map4.bucketCount()));
log("size = %d", static_cast<int>(map4.size()));
for (int i = 0; i < map4.bucketCount(); ++i)
{
log("bucket_size(%d) = %d", i, static_cast<int>(map4.bucketSize(i)));
}
for (const auto& e : map4)
{
log("bucket(\"%s\"), bucket index = %d", e.first.c_str(), static_cast<int>(map4.bucket(e.first)));
}
log("----- all keys---------");
// keys and at
auto keys = map4.keys();
for (const auto& key : keys)
{
log("key = %s", key.c_str());
}
auto node10Key = map4.at("10");
map4.insert("100", node10Key);
map4.insert("101", node10Key);
map4.insert("102", node10Key);
log("------ keys for object --------");
auto keysForObject = map4.keys(node10Key);
for (const auto& key : keysForObject)
{
log("key = %s", key.c_str());
}
log("--------------");
// at in const function
constFunc(map4);
// find
auto nodeToFind = map4.find("10");
CC_UNUSED_PARAM(nodeToFind);
CCASSERT(nodeToFind->second->getTag() == 1010, "");
// insert
Map<std::string, Node*> map6;
auto node1 = Node::create();
node1->setTag(101);
auto node2 = Node::create();
node2->setTag(102);
auto node3 = Node::create();
node3->setTag(103);
map6.insert("insert01", node1);
map6.insert("insert02", node2);
map6.insert("insert03", node3);
CCASSERT(node1->getReferenceCount() == 2, "");
CCASSERT(node2->getReferenceCount() == 2, "");
CCASSERT(node3->getReferenceCount() == 2, "");
CCASSERT(map6.at("insert01") == node1, "");
CCASSERT(map6.at("insert02") == node2, "");
CCASSERT(map6.at("insert03") == node3, "");
// erase
Map<std::string, Node*> mapForErase = createMap();
mapForErase.erase(mapForErase.find("9"));
CCASSERT(mapForErase.find("9") == mapForErase.end(), "");
CCASSERT(mapForErase.size() == 19, "");
mapForErase.erase("7");
CCASSERT(mapForErase.find("7") == mapForErase.end(), "");
CCASSERT(mapForErase.size() == 18, "");
std::vector<std::string> itemsToRemove;
itemsToRemove.push_back("2");
itemsToRemove.push_back("3");
itemsToRemove.push_back("4");
mapForErase.erase(itemsToRemove);
CCASSERT(mapForErase.size() == 15, "");
// clear
Map<std::string, Node*> mapForClear = createMap();
auto mapForClearCopy = mapForClear;
mapForClear.clear();
for (const auto& e : mapForClearCopy)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second->getReferenceCount() == 2, "");
}
// get random object
// Set the seed by time
srand((unsigned)time(nullptr));
Map<std::string, Node*> mapForRandom = createMap();
log("<--- begin ---->");
for (int i = 0; i < mapForRandom.size(); ++i)
{
log("Map: random object tag = %d", mapForRandom.getRandomObject()->getTag());
}
log("<---- end ---->");
// Self assignment
Map<std::string, Node*> mapForSelfAssign = createMap();
mapForSelfAssign = mapForSelfAssign;
CCASSERT(mapForSelfAssign.size() == 20, "");
for (const auto& e : mapForSelfAssign)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second->getReferenceCount() == 2, "");
}
mapForSelfAssign = std::move(mapForSelfAssign);
CCASSERT(mapForSelfAssign.size() == 20, "");
for (const auto& e : mapForSelfAssign)
{
CC_UNUSED_PARAM(e);
CCASSERT(e.second->getReferenceCount() == 2, "");
}
}
//--------------------------以下是Value的使用，它完成基本数据类型到对象的包装--------
void ValueTest::onEnter()
{
UnitTestDemo::onEnter();
Value v1;
CCASSERT(v1.getType() == Value::Type::NONE, "");
CCASSERT(v1.isNull(), "");
Value v2(100);
CCASSERT(v2.getType() == Value::Type::INTEGER, "");
CCASSERT(!v2.isNull(), "");
Value v3(101.4f);
CCASSERT(v3.getType() == Value::Type::FLOAT, "");
CCASSERT(!v3.isNull(), "");
Value v4(106.1);
CCASSERT(v4.getType() == Value::Type::DOUBLE, "");
CCASSERT(!v4.isNull(), "");
unsigned char byte = 50;
Value v5(byte);
CCASSERT(v5.getType() == Value::Type::BYTE, "");
CCASSERT(!v5.isNull(), "");
Value v6(true);
CCASSERT(v6.getType() == Value::Type::BOOLEAN, "");
CCASSERT(!v6.isNull(), "");
Value v7("string");
CCASSERT(v7.getType() == Value::Type::STRING, "");
CCASSERT(!v7.isNull(), "");
Value v8(std::string("string2"));
CCASSERT(v8.getType() == Value::Type::STRING, "");
CCASSERT(!v8.isNull(), "");
auto createValueVector = [&](){
ValueVector ret;
ret.push_back(v1);
ret.push_back(v2);
ret.push_back(v3);
return ret;
};
Value v9(createValueVector());
CCASSERT(v9.getType() == Value::Type::VECTOR, "");
CCASSERT(!v9.isNull(), "");
auto createValueMap = [&](){
ValueMap ret;
ret["aaa"] = v1;
ret["bbb"] = v2;
ret["ccc"] = v3;
return ret;
};
Value v10(createValueMap());
CCASSERT(v10.getType() == Value::Type::MAP, "");
CCASSERT(!v10.isNull(), "");
auto createValueMapIntKey = [&](){
ValueMapIntKey ret;
ret[111] = v1;
ret[222] = v2;
ret[333] = v3;
return ret;
};
Value v11(createValueMapIntKey());
CCASSERT(v11.getType() == Value::Type::INT_KEY_MAP, "");
CCASSERT(!v11.isNull(), "");
}
----------------------------亲，学会了没----------------------------
Cocos2d-x 3.0final 终结者系列教程12-Vector&map&value,布布扣,bubuko.com
Cocos2d-x 3.0final 终结者系列教程12-Vector&map&value
原文地址：http://blog.csdn.net/sdhjob/article/details/27642509
