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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include <xplatform.h>
#include <platformdefines.h>
#include <ComHelpers.h>
#include <algorithm>
class IntegerEnumerator : public UnknownImpl, public IEnumVARIANT
{
int start;
int count;
int current;
public:
IntegerEnumerator(int start, int count)
:UnknownImpl(),
start(start),
count(count),
current(start)
{
}
HRESULT STDMETHODCALLTYPE Next(
ULONG celt,
VARIANT *rgVar,
ULONG *pCeltFetched) override
{
for(*pCeltFetched = 0; *pCeltFetched < celt && current < start + count; ++*pCeltFetched, ++current)
{
VariantClear(&(rgVar[*pCeltFetched]));
V_VT(&rgVar[*pCeltFetched]) = VT_I4;
V_I4(&(rgVar[*pCeltFetched])) = current;
}
return celt == *pCeltFetched ? S_OK : S_FALSE;
}
HRESULT STDMETHODCALLTYPE Skip(ULONG celt) override
{
int original = current;
current = std::min(current + (int)celt, start + count);
return original + (int)celt <= start + count ? S_OK : S_FALSE;
}
HRESULT STDMETHODCALLTYPE Reset(void) override
{
current = start;
return S_OK;
}
HRESULT STDMETHODCALLTYPE Clone(IEnumVARIANT **ppEnum) override
{
IntegerEnumerator* clone = new IntegerEnumerator(start, count);
clone->current = current;
*ppEnum = clone;
return S_OK;
}
HRESULT STDMETHODCALLTYPE QueryInterface(
REFIID riid,
void** ppvObject)
{
return DoQueryInterface<IntegerEnumerator, IEnumVARIANT>(this, riid, ppvObject);
}
DEFINE_REF_COUNTING();
};
class IntegerEnumerable : public UnknownImpl, public IDispatch
{
private:
int start;
int count;
public:
IntegerEnumerable(int start, int count)
:UnknownImpl(),
start(start),
count(count)
{
}
HRESULT STDMETHODCALLTYPE GetTypeInfoCount(
UINT *pctinfo) override
{
*pctinfo = 0;
return S_OK;
}
HRESULT STDMETHODCALLTYPE GetTypeInfo(
UINT iTInfo,
LCID lcid,
ITypeInfo **ppTInfo) override
{
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE GetIDsOfNames(
REFIID riid,
LPOLESTR *rgszNames,
UINT cNames,
LCID lcid,
DISPID *rgDispId) override
{
bool containsUnknown = false;
DISPID *curr = rgDispId;
for (UINT i = 0; i < cNames; ++i)
{
*curr = DISPID_UNKNOWN;
LPOLESTR name = rgszNames[i];
if(wcscmp(name, W("GetEnumerator")) == 0)
{
*curr = DISPID_NEWENUM;
}
containsUnknown &= (*curr == DISPID_UNKNOWN);
curr++;
}
return (containsUnknown) ? DISP_E_UNKNOWNNAME : S_OK;
}
HRESULT STDMETHODCALLTYPE Invoke(
DISPID dispIdMember,
REFIID riid,
LCID lcid,
WORD wFlags,
DISPPARAMS *pDispParams,
VARIANT *pVarResult,
EXCEPINFO *pExcepInfo,
UINT *puArgErr) override
{
if (dispIdMember == DISPID_NEWENUM && (wFlags & INVOKE_PROPERTYGET) == INVOKE_PROPERTYGET)
{
V_VT(pVarResult) = VT_UNKNOWN;
V_UNKNOWN(pVarResult) = new IntegerEnumerator(start, count);
return S_OK;
}
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE QueryInterface(
REFIID riid,
void** ppvObject)
{
return DoQueryInterface<IntegerEnumerable, IDispatch>(this, riid, ppvObject);
}
DEFINE_REF_COUNTING();
};
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