Skype 的协议被破解了 [Solidot News]
关于PHP将数据常驻内存的讨论[原创]
3
2006/07/15 
05:35 
8604
其实这是一个非常普遍的问题，同时对于其他的容器vector,deque,map,list,stack,queue,priority_queue,multimap,set,multiset,hash_map所有的都适用的！
详情请看：
看看问题的提出：
I have a list of pointers. e.g
A* a = new A(); // A is a class
stl::list list_a;
I am inserting object of class in the after allocating memeory thru new
operator.
But when i want to erase all elements from the list. my progam crashes.
I delete element by using a iterator.
A * temp = NULL;
stl::list::iterator Iter,
stl::list::iterator IterTemp;
for( Iter = list_a.begin() ; Iter != list_a.end() ; ){
Iter = list_a.begin();
temp = *Iter;
IterTemp = Iter;
Iter++;
list_a.erase(IterTemp);
delete temp;
}
At erase line my program crashes and debugger shows some exception in
erase function.
Any help is greatly appreciated.
Thanks in advance.
Vibhor Mahajan
对他的问题，熟悉的人明显就可以看到问题非常明显，这位朋友的代码可以说写的非常糟糕！
当然，要删除这个指针还是不难的！
看看一些正确的回复吧！
Really, when you want to do that kind of things, the *best* way to go
IMHO is :
std::list::iterator it;
for(it = list_a.begin() ; it != list_a.end() ; ++it)
{
delete *it;
}
list_a.clear();
It will be much faster and much more readable.
First of all, it should be std::list, not stl::list.
Second, rewrite your delete loop as follows:
for (iter = list_a.begin(); iter != list_a.end ; )
{
delete (*iter);
iter = list_a.erase(iter);
}
下面的回复更加精彩！
or even:
// template is more generic
template
struct DeletePointer : public std::unary_function
{
void operator()(T* ptr) { delete ptr; }
};
std::for_each(list_a.begin(), list_a.end(), DeletePointer());
list_a.clear();
希望这篇文章能够给大家带来一些帮助
详情请看：
看看问题的提出：
引用
I have a list of pointers. e.g
A* a = new A(); // A is a class
stl::list
I am inserting object of class in the after allocating memeory thru new
operator.
But when i want to erase all elements from the list. my progam crashes.
I delete element by using a iterator.
A * temp = NULL;
stl::list
stl::list
for( Iter = list_a.begin() ; Iter != list_a.end() ; ){
Iter = list_a.begin();
temp = *Iter;
IterTemp = Iter;
Iter++;
list_a.erase(IterTemp);
delete temp;
}
At erase line my program crashes and debugger shows some exception in
erase function.
Any help is greatly appreciated.
Thanks in advance.
Vibhor Mahajan
对他的问题，熟悉的人明显就可以看到问题非常明显，这位朋友的代码可以说写的非常糟糕！
当然，要删除这个指针还是不难的！
看看一些正确的回复吧！
引用
Really, when you want to do that kind of things, the *best* way to go
IMHO is :
std::list
for(it = list_a.begin() ; it != list_a.end() ; ++it)
{
delete *it;
}
list_a.clear();
It will be much faster and much more readable.
引用
First of all, it should be std::list, not stl::list.
Second, rewrite your delete loop as follows:
for (iter = list_a.begin(); iter != list_a.end ; )
{
delete (*iter);
iter = list_a.erase(iter);
}
下面的回复更加精彩！
引用
or even:
// template is more generic
template
struct DeletePointer : public std::unary_function
{
void operator()(T* ptr) { delete ptr; }
};
std::for_each(list_a.begin(), list_a.end(), DeletePointer());
list_a.clear();
希望这篇文章能够给大家带来一些帮助
1 
