如何制作Vector =指针 [英] How To Make Vector = Pointer
问题描述
这就是我所拥有的：
void miniVector< T> :: insertOrder（miniVector< T>& v，const T& item）
{
int i，j;
T target;
vSize + = 1;
T newVector;
newVector = new T [vSize];
for（i = 0; i< vSize-1; i ++）
newVector [i] = v [i];
newVector [vSize] = item;
v = newVector;
}
问题是编译器不允许我设置v = newVector;。我b $ b得到以下错误：
错误：无效转换为''int *''到''int''
我要做的是创建一个比现有向量大一号的新向量
以添加项目。如何使
现有向量等于新指针？谢谢！
参见上下文
" Bob" <博*********** @ yahoo.com>在消息中写道
news：11 ********************* @ g14g2000cwa.googlegro ups.com ...这就是我所拥有的：
void miniVector< T> :: insertOrder（miniVector< T>& v，const T& item）
int i，j;
T target;
vSize + = 1;
T newVector;
newVector = new T [vSize];
^^^^你试图向类型为T的对象提供一个指向数组的指针
类型为T的对象
试试这个：
T * newVector = new T [vSize];
for（i = 0; i< vSize-1; i ++）
newVector [i] = v [i];
newVector [vSize] = item;
v = newVector;
^^^^^^^^^^^^^^希望你的miniVector< T>有一个赋值运算符
接受T *为rhs
//你也忘了
delete [] newVector;
}
问题是编译器不允许我设置v = newVector;。我收到以下错误：
错误：从''int *''无效转换为''int''
我想要的是什么do是为了添加项目，创建一个比现有向量大一个的新向量。如何使
现有向量等于新指针？谢谢！
我不会按你选择的方式去做。
Dan
"鲍勃" <博*********** @ yahoo.com>在消息中写道
news：11 ********************* @ g14g2000cwa.googlegro ups.com ...
< blockquote class =post_quotes>这就是我所拥有的：
void miniVector< T> :: insertOrder（miniVector< T>& v，const T& item）
{
int i，j;
T target;
vSize + = 1;
T newVector;
newVector = new T [vSize];
for（i = 0; i< vSize-1; i ++）
newVector [i] = v [i];
newVector [vSize] = item;
v = newVector;
}
为什么你不这样做？
void miniVector< T> :: insertOrder（miniVector< T>& v，const T& item）
{
v.push_back（item）;
}
感谢您的提示，但仍然没有让我设置v = newVector;。
这是'修改后的代码：
模板< typename T>
void miniVector< T> :: insertOrder（miniVector< T> ;& v，const T& item）
{
int i，j;
T target;
vSize + = 1;
T * newVector = new T [vSize];
for（i = 0; i< vSize-1; i ++）
newVector [i] = v [i];
newVector [vSize] = item;
v = newVector;
delete [] newVector;
}
我输错了什么？谢谢！
Here''s what I have:
void miniVector<T>::insertOrder(miniVector<T>& v,const T& item)
{
int i, j;
T target;
vSize += 1;
T newVector;
newVector=new T[vSize];
for(i = 0; i < vSize-1; i++)
newVector[i] = v[i];
newVector[vSize] = item;
v = newVector;
}
The problem is that the compiler won''t let me set "v = newVector;". I
get the following error:
error: invalid conversion from ''int*'' to ''int''
What I''m trying to do is create a new vector that is one size larger
than an existing vector in order to add an item. How can I make the
existing vector equal to the new pointer? Thanks!
see in context
"Bob" <bo***********@yahoo.com> wrote in message
news:11*********************@g14g2000cwa.googlegro ups.com...Here''s what I have:
void miniVector<T>::insertOrder(miniVector<T>& v,const T& item)
{
int i, j;
T target;
vSize += 1;
T newVector;
newVector=new T[vSize]; ^^^^ you are trying to assing to an object of type T a pointer to an array
of objects of type T
try this instead:
T* newVector = new T[vSize];
for(i = 0; i < vSize-1; i++)
newVector[i] = v[i];
newVector[vSize] = item;
v = newVector; ^^^^^^^^^^^^^^ hope that your miniVector<T> has an assignment operator that
accepts T* as rhs
// you also forgot to
delete[] newVector;
}
The problem is that the compiler won''t let me set "v = newVector;". I
get the following error:
error: invalid conversion from ''int*'' to ''int''
What I''m trying to do is create a new vector that is one size larger
than an existing vector in order to add an item. How can I make the
existing vector equal to the new pointer? Thanks!
I wouldn''t do it the way you chose.
Dan
"Bob" <bo***********@yahoo.com> wrote in message
news:11*********************@g14g2000cwa.googlegro ups.com...
Here''s what I have:
void miniVector<T>::insertOrder(miniVector<T>& v,const T& item)
{
int i, j;
T target;
vSize += 1;
T newVector;
newVector=new T[vSize];
for(i = 0; i < vSize-1; i++)
newVector[i] = v[i];
newVector[vSize] = item;
v = newVector;
}
Why don''t you just do this?
void miniVector<T>::insertOrder(miniVector<T>& v, const T& item)
{
v.push_back(item);
}
Thanks for the tip, but that still doesn''t let me set "v = newVector;".
Here''s the modified code:
template <typename T>
void miniVector<T>::insertOrder(miniVector<T>& v,const T& item)
{
int i, j;
T target;
vSize += 1;
T* newVector = new T[vSize];
for(i = 0; i < vSize-1; i++)
newVector[i] = v[i];
newVector[vSize] = item;
v = newVector;
delete [] newVector;
}
Did I type something wrong? Thanks!
这篇关于如何制作Vector =指针的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
