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‎docs/extensibility/debugger/reference/idebuggenericparamfield-getconstraints.md

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title: "IDebugGenericParamField::GetConstraints | Microsoft Docs"
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ms.date: "11/04/2016"
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ms.topic: "conceptual"
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helpviewer_keywords:
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helpviewer_keywords:
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- "IDebugGenericParamField::GetConstraints"
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- "GetConstraints"
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ms.assetid: 86a78b5a-ee0f-4999-a0ba-919d3dc7d969
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author: "gregvanl"
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ms.author: "gregvanl"
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manager: jillfra
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ms.workload:
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ms.workload:
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- "vssdk"
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---
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# IDebugGenericParamField::GetConstraints
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Retrieves the constraints that are associated with this generic parameter.
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## Syntax
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```cpp
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HRESULT GetConstraints(
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ULONG32 cConstraints,
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IDebugField** ppConstraints,
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ULONG32* pcConstraints
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);
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```
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```csharp
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int GetConstraints(
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uint cConstraints,
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out IDebugField[] ppConstraints,
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ref uint pcConstraints
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);
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```
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#### Parameters
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`cConstraints`
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[in] Number of constraints.
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`ppConstraints`
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[out] Returns an array that contains the constraints associated with this field.
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`pcConstraints`
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[in, out] Number of constraints in the `ppConstraints` array.
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## Return Value
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If successful, returns `S_OK`; otherwise, returns an error code.
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## Example
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The following example shows how to implement this method for a **CDebugGenericParamFieldType** object that exposes the [IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md) interface.
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```cpp
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HRESULT CDebugGenericParamFieldType::GetConstraints(
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ULONG32 cConstraints,
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IDebugField** ppConstraints,
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ULONG32* pcConstraints)
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{
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HRESULT hr = S_OK;
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CComPtr<IMetaDataImport> pMetadata;
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CComPtr<IMetaDataImport2> pMetadata2;
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mdGenericParamConstraint* rgParamConsts = NULL;
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HCORENUM hEnum = 0;
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ULONG cConst = 0;
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ULONG iConst;
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ULONG iConstOut = 0;
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METHOD_ENTRY( CDebugGenericParamFieldType::GetConstraints );
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IfFalseGo(ppConstraints && pcConstraints, E_INVALIDARG );
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*pcConstraints = 0;
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IfNullGo( rgParamConsts = new mdGenericParamConstraint[cConstraints], E_OUTOFMEMORY);
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IfFailGo( m_spSH->GetMetadata( m_idModule, &pMetadata ) );
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IfFailGo( pMetadata->QueryInterface(IID_IMetaDataImport2, (void**)&pMetadata2) );
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IfFailGo( pMetadata2->EnumGenericParamConstraints( &hEnum,
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m_tokParam,
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rgParamConsts,
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cConstraints,
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&cConst) );
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pMetadata->CloseEnum(hEnum);
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hEnum = NULL;
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for (iConst = 0; iConst < cConst; iConst++)
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{
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mdToken tokConst;
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IfFailGo( pMetadata2->GetGenericParamConstraintProps( rgParamConsts[iConst],
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NULL,
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&tokConst ) );
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switch (TypeFromToken(tokConst))
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{
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case mdtTypeRef:
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{
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Module_ID mid;
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mdTypeDef tokClass;
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IfFailGo( CDebugClassFieldType::GetClassToken(m_spSH, m_idModule, tokConst, &mid, &tokClass) );
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IfFailGo( m_spSH->CreateClassType( mid, tokClass, ppConstraints + iConstOut ) );
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iConstOut++;
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break;
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}
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case mdtTypeDef:
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{
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IfFailGo( m_spSH->CreateClassType( m_idModule, tokConst, ppConstraints + iConstOut ) );
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iConstOut++;
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break;
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}
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case mdtTypeSpec:
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{
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PCCOR_SIGNATURE pvSig;
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ULONG cbSig;
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DWORD cb = 0;
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DWORD dwElementType;
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IfFailGo( pMetadata2->GetTypeSpecFromToken( tokConst, &pvSig, &cbSig) );
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cb += CorSigUncompressData(&(pvSig[cb]), &dwElementType);
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IfFailGo( m_spSH->CreateType( pvSig, cbSig, m_idModule, mdMethodDefNil, m_pGenScope, ppConstraints + iConstOut ) );
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iConstOut++;
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break;
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}
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default:
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{
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ASSERT(!"Bad constraint token");
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}
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}
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}
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*pcConstraints = iConstOut;
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Error:
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METHOD_EXIT( CDebugGenericParamFieldType::GetConstraints, hr );
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DELETERG(rgParamConsts);
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return hr;
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}
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```
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## See Also
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[IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md)
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Retrieves the constraints that are associated with this generic parameter.
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## Syntax
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```cpp
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HRESULT GetConstraints(
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ULONG32 cConstraints,
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IDebugField** ppConstraints,
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ULONG32* pcConstraints
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);
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```
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```csharp
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int GetConstraints(
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uint cConstraints,
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out IDebugField[] ppConstraints,
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ref uint pcConstraints
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);
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```
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#### Parameters
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`cConstraints`
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[in] Number of constraints.
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`ppConstraints`
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[out] Returns an array that contains the constraints associated with this field.
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`pcConstraints`
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[in, out] Number of constraints in the `ppConstraints` array.
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## Return Value
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If successful, returns `S_OK`; otherwise, returns an error code.
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## Example
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The following example shows how to implement this method for a **CDebugGenericParamFieldType** object that exposes the [IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md) interface.
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```cpp
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HRESULT CDebugGenericParamFieldType::GetConstraints(
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ULONG32 cConstraints,
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IDebugField** ppConstraints,
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ULONG32* pcConstraints)
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{
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HRESULT hr = S_OK;
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CComPtr<IMetaDataImport> pMetadata;
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CComPtr<IMetaDataImport2> pMetadata2;
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mdGenericParamConstraint* rgParamConsts = NULL;
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HCORENUM hEnum = 0;
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ULONG cConst = 0;
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ULONG iConst;
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ULONG iConstOut = 0;
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METHOD_ENTRY( CDebugGenericParamFieldType::GetConstraints );
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IfFalseGo(ppConstraints && pcConstraints, E_INVALIDARG );
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*pcConstraints = 0;
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IfNullGo( rgParamConsts = new mdGenericParamConstraint[cConstraints], E_OUTOFMEMORY);
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IfFailGo( m_spSH->GetMetadata( m_idModule, &pMetadata ) );
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IfFailGo( pMetadata->QueryInterface(IID_IMetaDataImport2, (void**)&pMetadata2) );
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IfFailGo( pMetadata2->EnumGenericParamConstraints( &hEnum,
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m_tokParam,
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rgParamConsts,
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cConstraints,
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&cConst) );
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pMetadata->CloseEnum(hEnum);
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hEnum = NULL;
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for (iConst = 0; iConst < cConst; iConst++)
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{
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mdToken tokConst;
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IfFailGo( pMetadata2->GetGenericParamConstraintProps( rgParamConsts[iConst],
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NULL,
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&tokConst ) );
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switch (TypeFromToken(tokConst))
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{
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case mdtTypeRef:
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{
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Module_ID mid;
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mdTypeDef tokClass;
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IfFailGo( CDebugClassFieldType::GetClassToken(m_spSH, m_idModule, tokConst, &mid, &tokClass) );
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IfFailGo( m_spSH->CreateClassType( mid, tokClass, ppConstraints + iConstOut ) );
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iConstOut++;
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break;
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}
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case mdtTypeDef:
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{
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IfFailGo( m_spSH->CreateClassType( m_idModule, tokConst, ppConstraints + iConstOut ) );
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iConstOut++;
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break;
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}
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case mdtTypeSpec:
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{
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PCCOR_SIGNATURE pvSig;
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ULONG cbSig;
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DWORD cb = 0;
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DWORD dwElementType;
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IfFailGo( pMetadata2->GetTypeSpecFromToken( tokConst, &pvSig, &cbSig) );
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cb += CorSigUncompressData(&(pvSig[cb]), &dwElementType);
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IfFailGo( m_spSH->CreateType( pvSig, cbSig, m_idModule, mdMethodDefNil, m_pGenScope, ppConstraints + iConstOut ) );
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iConstOut++;
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break;
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}
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default:
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{
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ASSERT(!"Bad constraint token");
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}
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}
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}
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*pcConstraints = iConstOut;
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Error:
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METHOD_EXIT( CDebugGenericParamFieldType::GetConstraints, hr );
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DELETERG(rgParamConsts);
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return hr;
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}
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```
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## See Also
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[IDebugGenericParamField](../../../extensibility/debugger/reference/idebuggenericparamfield.md)

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