1
Accelerated C++的第11章介紹了實現模板類的過程,以STL的向量類的簡化版本爲例。練習11-6希望我們將.erase()
和.clear()
方法添加到類中,所以我首先直接從書中複製最終代碼並嘗試編譯,但失敗了。然後我把所有的函數定義移動到.h文件中(根據需要刪除Vec<T>::
等東西)並編譯我的main.cpp,它工作。實現簡化的C++向量類副本 - 不會編譯
這裏是我的所有代碼:
的main.cpp
#include <iostream>
#include "Vec.h"
using std::cout;
using std::endl;
int main()
{
Vec<int> v;
for (int i = 1; i < 10; ++i)
v.push_back(i);
for(Vec<int>::const_iterator iter = v.begin();
iter != v.end(); ++iter)
cout << *iter << endl;
return 0;
}
Vec.h
#ifndef GUARD_Vec_h
#define GUARD_Vec_h
#include <cstddef>
#include <memory>
template <class T> class Vec {
public:
// member variables
typedef T* iterator;
typedef const T* const_iterator;
typedef std::size_t size_type;
typedef T value_type;
typedef T& reference;
typedef const T& const_reference;
// constructors + destructors
Vec() { create(); }
explicit Vec(size_type n, const T& t = T()) { create(n, t); }
Vec(const Vec& v) { create(v.begin(), v.end()); }
~Vec() { uncreate(); }
// methods
T& operator[](size_type i) { return data[i]; }
const T& operator[](size_type i) const { return data[i]; }
void push_back(const T& t) {
if (avail == limit)
grow();
unchecked_append(t);
}
size_type size() const { return avail - data; }
iterator begin() { return data; }
const_iterator begin() const { return data; }
iterator end() { return avail; }
const_iterator end() const { return avail; }
private:
iterator data;
iterator avail;
iterator limit;
std::allocator<T> alloc;
void create();
void create(size_type, const T&);
void create(const_iterator, const_iterator);
void uncreate();
void grow();
void unchecked_append(const T&);
};
#endif GUARD_Vec_h
Vec.cpp
#include <algorithm>
#include <cstddef>
#include <memory>
#include "Vec.h"
using std::allocator;
using std::max;
using std::uninitialized_copy;
using std::uninitialized_fill;
using std::ptrdiff_t;
template <class T> void Vec<T>::create()
{
data = avail = limit = 0;
}
template <class T> void Vec<T>::create(size_type n, const T& val)
{
data = alloc.allocate(n);
limit = avail = data + n;
uninitialized_fill(data, limit, val);
}
template <class T> void Vec<T>::create(const_iterator i, const_iterator j)
{
data = alloc.allocate(j - i);
limit = avail = uninitialized_copy(i, j, data);
}
template <class T> void Vec<T>::uncreate()
{
if (data) {
iterator it = avail;
while (it != data)
alloc.destroy(--it);
alloc.deallocate(data, limit - data);
}
data = limit = avail = 0;
}
template <class T> void Vec<T>::grow()
{
size_type new_size = max(2 * (limit - data), ptrdiff_t(1));
iterator new_data = alloc.allocate(new_size);
iterator new_avail = uninitialized_copy(data, avail, new_data);
uncreate();
data = new_data;
avail = new_avail;
limit = data + new_size;
}
template <class T> void Vec<T>::unchecked_append(const T& val)
{
alloc.construct(avail++, val);
}
爲什麼這個編譯不?
我發現很難相信這本書沒有解釋爲什麼模板定義必須放在頭文件中......在任何情況下,閱讀[this](http://www.parashift.com/c++-faq) -lite/templates.html#FAQ-35.15)。 – ildjarn 2011-12-15 23:04:59