<分区>
请问typedef在C++中的正确位置
版本 1:类外类型定义
typedef std::pair<std::string, int> StrIntPair;
typedef std::vector<StrIntPair> StrIntPairVec;
class MyData
{
public:
MyData(){};
~MyData(){};
private:
void addInfo(const StrIntPair &info)
{
infoVec.push_back(info);
}
StrIntPair info;
StrIntPairVec infoVec;
};
Version2 : typedef inside class public
class MyData
{
public:
MyData(){};
~MyData(){};
typedef std::pair<std::string, int> StrIntPair;
typedef std::vector<StrIntPair> StrIntPairVec;
private:
void addInfo(const StrIntPair &info)
{
infoVec.push_back(info);
}
StrIntPair info;
StrIntPairVec infoVec;
};
Version3 : typedef inside class private
class MyData
{
public:
MyData(){};
~MyData(){};
private:
typedef std::pair<std::string, int> StrIntPair;
typedef std::vector<StrIntPair> StrIntPairVec;
void addInfo(const StrIntPair &info)
{
infoVec.push_back(info);
}
StrIntPair info;
StrIntPairVec infoVec;
};
哪个版本是最佳实践？