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Return popped element in List

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This commit is contained in:
Vinnie Falco
2013-08-01 23:44:02 -07:00
parent 5e33606f1a
commit 93b98b77f7
1 changed files with 20 additions and 12 deletions
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32
Subtrees/beast/modules/beast_core/containers/beast_List.h
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@@ -315,6 +315,14 @@ public:
typedef Element* pointer; typedef Element* pointer;
typedef Element const* const_pointer; typedef Element const* const_pointer;
/** Thrown when some members are called with an empty list. */
struct empty_list_error : std::logic_error
{
empty_list_error () : std::logic_error ("empty list")
{
}
};
class Node : Uncopyable class Node : Uncopyable
{ {
public: public:
@@ -474,7 +482,7 @@ public:
reference front () reference front ()
{ {
if (empty ()) if (empty ())
Throw (Error ().fail (__FILE__, __LINE__, Error::noMoreData)); Throw (empty_list_error (), __FILE__, __LINE__);
return element_from (m_head.m_next); return element_from (m_head.m_next);
} }
@@ -488,7 +496,7 @@ public:
const_reference front () const const_reference front () const
{ {
if (empty ()) if (empty ())
Throw (Error ().fail (__FILE__, __LINE__, Error::noMoreData)); Throw (empty_list_error (), __FILE__, __LINE__);
return element_from (m_head.m_next); return element_from (m_head.m_next);
} }
@@ -502,7 +510,7 @@ public:
reference back () reference back ()
{ {
if (empty ()) if (empty ())
Throw (Error ().fail (__FILE__, __LINE__, Error::noMoreData)); Throw (empty_list_error (), __FILE__, __LINE__);
return element_from (m_tail.m_prev); return element_from (m_tail.m_prev);
} }
@@ -516,7 +524,7 @@ public:
const_reference back () const const_reference back () const
{ {
if (empty ()) if (empty ())
Throw (Error ().fail (__FILE__, __LINE__, Error::noMoreData)); Throw (empty_list_error (), __FILE__, __LINE__);
return element_from (m_tail.m_prev); return element_from (m_tail.m_prev);
} }
@@ -671,13 +679,13 @@ public:
/** Remove the element at the beginning of the list. /** Remove the element at the beginning of the list.
@invariant The list must not be empty. @invariant The list must not be empty.
@return A reference to the popped element.
*/ */
void pop_front () Element& pop_front ()
{ {
if (empty ()) Element& elem (front ());
Throw (Error ().fail (__FILE__, __LINE__, Error::noMoreData));
erase (begin ()); erase (begin ());
return elem;
} }
/** Append an element at the end of the list. /** Append an element at the end of the list.
@@ -694,13 +702,13 @@ public:
/** Remove the element at the end of the list. /** Remove the element at the end of the list.
@invariant The list must not be empty. @invariant The list must not be empty.
@return A reference to the popped element.
*/ */
void pop_back () Element& pop_back ()
{ {
if (empty ()) Element& elem (back ());
Throw (Error ().fail (__FILE__, __LINE__, Error::noMoreData));
erase (--end ()); erase (--end ());
return elem;
} }
/** Swap contents with another list. /** Swap contents with another list.