1 files changed, 123 insertions, 0 deletions
diff --git a/include/comphelper/unwrapargs.hxx b/include/comphelper/unwrapargs.hxx
new file mode 100644
index 000000000..041c69da1
--- /dev/null
+++ b/include/comphelper/unwrapargs.hxx
@@ -0,0 +1,123 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_COMPHELPER_UNWRAPARGS_HXX
+#define INCLUDED_COMPHELPER_UNWRAPARGS_HXX
+
+#include <sal/config.h>
+
+#include <optional>
+
+#include <rtl/ustrbuf.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/uno/XInterface.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <cppu/unotype.hxx>
+
+namespace comphelper {
+
+/// @internal
+namespace detail {
+    inline void unwrapArgsError(
+        const OUString& str, sal_Int32 nArg,
+        const css::uno::Reference< css::uno::XInterface >& xErrorContext =
+          css::uno::Reference< css::uno::XInterface >() )
+    {
+        throw css::lang::IllegalArgumentException(
+            str, xErrorContext, static_cast< sal_Int16 >( nArg ) );
+    }
+
+    template< typename T, typename... Args >
+    inline void unwrapArgsError( const OUString& str, sal_Int32 nArg, T&, Args&... args )
+    {
+        return unwrapArgsError( str, nArg, args... );
+    }
+
+    inline void unwrapArgs(
+        const css::uno::Sequence< css::uno::Any >&,
+        sal_Int32,
+        const css::uno::Reference< css::uno::XInterface >& )
+    {
+        return;
+    }
+
+    inline void unwrapArgs(
+        const css::uno::Sequence< css::uno::Any >&,
+        sal_Int32 )
+    {
+        return;
+    }
+
+    template< typename T, typename... Args >
+    inline void unwrapArgs(
+        const css::uno::Sequence< css::uno::Any >& seq,
+        sal_Int32 nArg, ::std::optional< T >& v, Args&... args );
+
+    template< typename T, typename... Args >
+    inline void unwrapArgs(
+        const css::uno::Sequence< css::uno::Any >& seq,
+        sal_Int32 nArg, T& v, Args&... args )
+    {
+        if( seq.getLength() <= nArg )
+        {
+            return unwrapArgsError( OUString( "No such argument available!"),
+                                     nArg, args... );
+        }
+        if( !fromAny( seq[nArg], &v ) )
+        {
+            OUString msg =
+                "Cannot extract ANY { " +
+                seq[nArg].getValueType().getTypeName() +
+                " } to " +
+                ::cppu::UnoType<T>::get().getTypeName() +
+                "!";
+            return unwrapArgsError( msg, nArg, args... );
+        }
+        return unwrapArgs( seq, ++nArg, args... );
+    }
+
+    template< typename T, typename... Args >
+    inline void unwrapArgs(
+        const css::uno::Sequence< css::uno::Any >& seq,
+        sal_Int32 nArg, ::std::optional< T >& v, Args&... args )
+    {
+        if( nArg < seq.getLength() )
+        {
+            T t;
+            unwrapArgs( seq, nArg, t, args... );
+            v = t;
+        } else {
+            unwrapArgs( seq, ++nArg, args... );
+        }
+    }
+}
+
+template< typename... Args >
+inline void unwrapArgs(
+    const css::uno::Sequence< css::uno::Any >& seq,
+    Args&... args )
+{
+    return detail::unwrapArgs( seq, 0, args... );
+}
+
+} // namespace comphelper
+
+#endif //  ! defined( INCLUDED_COMPHELPER_UNWRAPARGS_HXX)
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */