etc/config/src/TEMPLATE_ON_RETURN_TYPE.cpp

// checking template overloads on return type

/***************************************************************************
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the  License is distributed on an  "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
 * implied.   See  the License  for  the  specific language  governing
 * permissions and limitations under the License.
 *
 * Copyright 1999-2007 Rogue Wave Software, Inc.
 * 
 **************************************************************************/


template <class T>
struct A { char dummy [8]; };

template <class T, class U>
struct B { T t; char dummy [16]; };


// exercise the compiler's ability to define a function template
// whose template paramenter is used only in the return type of
// the template and not in its argument list; this requires that
// the type of the template argument be mangled into the name of
// each specialization of the template

template <class T, class U>
T bar (U)
{
    return T ();
}

int size;

template <class T>
T foo ()
{
    size = sizeof (T);

    return bar<T>("");
}

template <class T, class U>
B<T, U> foobar ()
{
    return foo<B<T, U> >();
}


int main ()
{
    int result = 0;

    foo<char>();

    if (size != sizeof (char))
        result = result << 1 + 1;

    foo<A<char> >();

    if (size != sizeof (A<char>))
        result = result << 1 + 1;

    foo<B<A<char>, int> >();

    if (size != sizeof (B<A<char>, int>))
        result = result << 1 + 1;

    foobar<char, B<char, A<int> > >();

    if (size != sizeof (B<char, B<char, A<int> > >))
        result = result << 1 + 1;

    return result;
}