1#include <iostream>23usingnamespacestd;4classalloc {56};78template<classT,classAlloc = alloc>9classvector {10public:11typedef T value_type;12typedef value_type*iterator;13//测试class template内能否再有template14template<classI>15voidinsert(iterator position, I first, I last) {16cout <<"inse...
template<typename T1,typename T2>classtest<constT1*,T2*>{//偏特化(针对const指针)... };//例如c++标准库中的类vector的定义template <classT,classAllocator>classvector {//…//};template <classAllocator>//这个偏特化的例子中,一个参数被绑定到bool类型,而另一个参数仍未绑定需要由用户指定。classvector...
template<class T> class allocator { ... template<class Other> struct rebind { typedef allocator<Other> other; }; }; Run Code Online (Sandbox Code Playgroud) 使用分配器的类做了多余的事情: template<class T, class Alloc = std::allocator<T> > class vector { ... }; Run Code Online ...
策略(policy)一般是一个类模板,典型的策略是 STL 容器(如 std::vector<>,完整声明是template<class T, class Alloc=allocator<T>> class vector;)的分配器(这个参数有默认参数,即默认存储策略),策略类将模板的经常变化的那一部分子功能块集中起来作为模板参数,这样模板便可以更为通用,这和特性的思想是类似的(...
template <typename T> class Stack { public: Stack() = default; Stack(T e): elem_({e}){}; protected: std::vector<T> elem_; }; Stack intStack = 0; //通过构造函数推断为int 2.类型推导时,构造函数参数应该按照值传递,而非按引用。引用传递会导致类型推断时无法进行 decay 转化。
template<typenameT,//默认指定为dequetemplate<typenameE,typenameAlloc=std::allocator<E>>classContainer=std::deque>classStack{public:voidpush(constT&val);voidpop();Ttop()const;boolempty()const;private:Container<T>c;};template<typenameT,template<typename,typename>classContainer>voidStack<T,Container>...
Template argument deduction is also performed when the name of a class template is used as the type of an object being constructed: std::pair p(2, 4.5); std::tuple t(4, 3, 2.5); std::copy_n(vi1, 3, std::back_insert_iterator(vi2)); std::for_each(vi.begin(), vi.end(),...
template < class charT, class traits = char_traits, // basic_string::traits_type class Alloc = allocator // basic_string::allocator_type > class basic_string; 1. basci_string封装一根指向字符类型的指针,也就是管理一个以'0'结尾的字符动态数组,有了诸多操作的封装,中间层有迭代器iterator和萃取器...
template <typename T> T* alloc(){//member function template,隐寓为inline函数 ... } ... }; template <typename T> class Collection::Handle{//member class template ... }; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. ...
The map class template looks like this: std::map<Key, Data, Compare, Alloc> STP map implementations are more like a balanced binary search trees (BST). To be more specific, they arered-black trees. Picture source:http://en.wikipedia.org/wiki/Red-black_tree ...