如何 typedef 模板类?
我应该如何typedef模板类?类似的东西:
How should I typedef a template class ? Something like:
typedef std::vector myVector; // <--- compiler error
我知道两种方法:
(1) #define myVector std::vector // not so good
(2) template<typename T>
struct myVector { typedef std::vector<T> type; }; // verbose
我们在 C++0x 中有什么更好的吗?
Do we have anything better in C++0x ?
推荐答案
是的.它被称为别名模板"，它是 C+ 中的一项新功能+11.
Yes. It is called an "alias template," and it's a new feature in C++11.
template<typename T>
using MyVector = std::vector<T, MyCustomAllocator<T>>;
使用将完全符合您的预期:
Usage would then be exactly as you expect:
MyVector<int> x; // same as: std::vector<int, MyCustomAllocator<int>>
GCC 从 4.7 开始支持，Clang 从 3.0 开始支持，MSVC 在 2013 SP4 开始支持.
GCC has supported it since 4.7, Clang has it since 3.0, and MSVC has it in 2013 SP4.
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