Share via

IDebugGenericParamField::ConstraintCount

  • Article

Applies to: yesVisual Studio noVisual Studio for Mac

Note

This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

Returns the number of constraints that are associated with this generic parameter.

Syntax

HRESULT ConstraintCount(
    ULONG32* pcConst
);

int ConstraintCount(
    ref uint pcConst
);

Parameters

pcConst
[in, out] Number of constraints that are associated with this field.

Return Value

If successful, returns S_OK; otherwise, returns an error code.

Example

The following example shows how to implement this method for a CDebugGenericParamFieldType object that exposes the IDebugGenericParamField interface.

HRESULT CDebugGenericParamFieldType::ConstraintCount(ULONG32* pcConst)
{
    HRESULT hr = S_OK;
    CComPtr<IMetaDataImport> pMetadata;
    CComPtr<IMetaDataImport2> pMetadata2;
    HCORENUM hEnum = 0;
    ULONG cConst = 0;

    METHOD_ENTRY( CDebugGenericParamFieldType::ConstraintCount );

    IfFalseGo(pcConst, E_INVALIDARG );
    *pcConst = 0;
    IfFailGo( m_spSH->GetMetadata( m_idModule, &pMetadata ) );
    IfFailGo( pMetadata->QueryInterface(IID_IMetaDataImport2, (void**)&pMetadata2) );
    IfFailGo( pMetadata2->EnumGenericParamConstraints( &hEnum,
              m_tokParam,
              NULL,
              0,
              &cConst) );
    IfFailGo( pMetadata->CountEnum(hEnum, &cConst) );
    pMetadata->CloseEnum(hEnum);
    hEnum = NULL;

    *pcConst = cConst;

Error:

    METHOD_EXIT( CDebugGenericParamFieldType::ConstraintCount, hr );
    return hr;
}

See also