C++智能指针配合STL模板类

代码


#include <unordered_map>
#include <set>
#include <memory>
class ResID {
public:using SP = std::shared_ptr<ResID>;ResID() = default;ResID(const std::string& id, const std::string& type): m_id(id), m_type(type){}public:~ResID() = default;bool isValid() const { return !m_id.empty() && !m_type.empty(); };bool isEqual(const ResID& other) const{return m_id == other.m_id && m_type == other.m_type;}std::string type() const { return m_type; }std::string id() const { return m_id; }void setType(const std::string& type) { m_type = type; }void setId(const std::string& id) { m_id = id; }// 自定义比较器struct Compare {bool operator()(ResID::SP lhs, ResID::SP rhs) const{// 根据`value`成员变量进行比较return std::tuple(lhs->type(), lhs->id()) < std::tuple(lhs->type(), lhs->id());}};using Set = std::set<ResID::SP, ResID::Compare>;// 自定义比较器struct Equal {bool operator()(ResID::SP lhs, ResID::SP rhs) const{return lhs->isEqual(*rhs);}};// 自定义比较器struct Hash {size_t operator()(ResID::SP lhs) const{return std::hash<std::string>()(lhs->type()) ^ std::hash<std::string>()(lhs->id());}};template<class T>using UMap= std::unordered_map<ResID::SP, T, ResID::Hash, ResID::Equal>;private:std::string m_id;std::string m_type;
};

示例


class Data{
public:
int value;
};auto resID = std::make_shared<ResID>("id", "type");
auto resID2 = std::make_shared<ResID>("id2", "type2");
ResID<Data>::UMap uMap;
uMap.emplace(resID, {});
uMap.emplace(resID2, {});
uMap.emplace(resID, {});
assert(uMap.size() == 2);