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PO
primarykey
Id
15919834
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2013-04-10T07:42:14.610
FavoriteCount
0
LastActivityDate
2013-04-10T07:47:55.893
LastEditDate
2013-04-10T07:47:55.893
LastEditorUserId
0
OwnerUserId
0
ParentId
15904896
PostTypeId
2
Score
22
ViewCount
0
LastEditorDisplayName
user2218982
text
Body
To make use of the range-based for-loop you have to provide either <code>begin()</code> and <code>end()</code> member functions or overload the non-member <code>begin()</code> and <code>end()</code> functions. In the latter case, you can wrap your range in a <code>std::pair</code> and overload <code>begin()</code> and <code>end()</code> for those: <pre><code> namespace std { template <typename T> T* begin(std::pair<T*, T*> const& p) { return p.first; } template <typename T> T* end(std::pair<T*, T*> const& p) { return p.second; } } </code></pre> Now you can use the for-loop like this: <pre><code> for (auto&& i : std::make_pair(array, array + size)) cout <</pre> Note, that the non-member <code>begin()</code> and <code>end()</code> functions have to be overloaded in the <code>std</code> namespace here, because <code>pair</code> also resides in namespace <code>std</code>. If you don't feel like tampering with the standard namespace, you can simply create your own tiny pair class and overload <code>begin()</code> and <code>end()</code> in your namespace. Or, create a thin wrapper around your dynamically allocated array and provide <code>begin()</code> and <code>end()</code> member functions: <pre><code> template <typename T> struct wrapped_array { wrapped_array(T* first, T* last) : begin_ {first}, end_ {last} {} wrapped_array(T* first, std::ptrdiff_t size) : wrapped_array {first, first + size} {} T* begin() const noexcept { return begin_; } T* end() const noexcept { return end_; } T* begin_; T* end_; }; template <typename T> wrapped_array<T> wrap_array(T* first, std::ptrdiff_t size) noexcept { return {first, size}; } </code></pre> And your call site looks like this: <pre><code> for (auto&& i : wrap_array(array, size)) std::cout <</pre> <a href="http://liveworkspace.org/code/3rzx8X$3" rel="noreferrer">Example</a>
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