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add more operations

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This commit is contained in:
邹晓航
2015-03-16 15:55:55 +08:00
parent 150206f38c
commit 92f641fffb
3 changed files with 77 additions and 8 deletions
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26
TinySTL/COWPtr.h
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@@ -16,11 +16,31 @@ namespace TinySTL{
cow_ptr(const cow_ptr& cp);
cow_ptr& operator = (const cow_ptr& cp);
element_type operator *()const;
element_type *operator ->()const;
const element_type& operator *()const;
const element_type *operator ->()const;
//ע<><D7A2> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܻ<EFBFBD><DCBB>ı<EFBFBD>ָ<EFBFBD><D6B8>ָ<EFBFBD><D6B8><EFBFBD>Ķ<EFBFBD><C4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><DDA3><EFBFBD>Ҫcow<6F><77><EFBFBD><EFBFBD>
//element_type& operator *();
//element_type *operator ->();
element_type *get();
const element_type *get()const;
operator bool() const;
private:
shared_ptr<element_type> ptr_;
public:
template<class T1, class T2>
friend bool operator == (const cow_ptr<T1>& cp1, const cow_ptr<T2>& cp2);
template<class T>
friend bool operator == (const cow_ptr<T>& cp, nullptr_t p);
template<class T>
friend bool operator == (nullptr_t p, const cow_ptr<T>& cp);
template<class T1, class T2>
friend bool operator != (const cow_ptr<T1>& cp1, const cow_ptr<T2>& cp2);
template<class T>
friend bool operator != (const cow_ptr<T>& cp, nullptr_t p);
template<class T>
friend bool operator != (nullptr_t p, const cow_ptr<T>& cp);
};
}

46
TinySTL/Detail/COWPtr.impl.h
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@@ -20,13 +20,55 @@ namespace TinySTL{
return *this;
}
template<class T>
typename cow_ptr<T>::element_type cow_ptr<T>::operator *()const{
const typename cow_ptr<T>::element_type& cow_ptr<T>::operator *()const{
return *ptr_;
}
template<class T>
typename cow_ptr<T>::element_type *cow_ptr<T>::operator ->()const{
const typename cow_ptr<T>::element_type *cow_ptr<T>::operator ->()const{
return ptr_.operator->();
}
//ע<><D7A2> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܻ<EFBFBD><DCBB>ı<EFBFBD>ָ<EFBFBD><D6B8>ָ<EFBFBD><D6B8><EFBFBD>Ķ<EFBFBD><C4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><DDA3><EFBFBD>Ҫcow<6F><77><EFBFBD><EFBFBD>
//template<class T>
//typename cow_ptr<T>::element_type& cow_ptr<T>::operator *();
//template<class T>
//typename cow_ptr<T>::element_type *cow_ptr<T>::operator ->();
template<class T>
typename cow_ptr<T>::element_type *cow_ptr<T>::get(){
return ptr_.get();
}
template<class T>
const typename cow_ptr<T>::element_type *cow_ptr<T>::get()const{
return ptr_.get();
}
template<class T>
cow_ptr<T>::operator bool()const{
return ptr_ != nullptr;
}
template<class T1, class T2>
bool operator == (const cow_ptr<T1>& cp1, const cow_ptr<T2>& cp2){
return cp1.ptr_ == cp2.ptr_;
}
template<class T>
bool operator == (const cow_ptr<T>& cp, nullptr_t p){
return cp.ptr_ == p;
}
template<class T>
bool operator == (nullptr_t p, const cow_ptr<T>& cp){
return cp == p;
}
template<class T1, class T2>
bool operator != (const cow_ptr<T1>& cp1, const cow_ptr<T2>& cp2){
return !(cp1 == cp2);
}
template<class T>
bool operator != (const cow_ptr<T>& cp, nullptr_t p){
return !(cp == p);
}
template<class T>
bool operator != (nullptr_t p, const cow_ptr<T>& cp){
return !(cp == p);
}
}
#endif

13
TinySTL/Test/COWPtrTest.cpp
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@@ -7,14 +7,21 @@ namespace TinySTL{
void testCase1(){
cow_ptr<string> cp1(new string("hello"));
assert(*cp1 == "hello");
assert(cp1);
cp1->append(" world");
auto cp2 = cp1;
assert(*cp2 == "hello world");
assert(*cp2 == "hello");
cow_ptr<string> cp3;
cp3 = cp1;
assert(*cp3 == "hello world");
assert(*cp3 == "hello");
assert(cp1.get() == cp2.get() && cp2.get() == cp3.get());
assert(cp1 == cp2 && !(cp2 != cp3));
cow_ptr<string> cp4;
assert(cp4 == nullptr);
}
void testAllCases(){