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- // Copyright (C) 2009-2012 Lorenzo Caminiti
- // Distributed under the Boost Software License, Version 1.0
- // (see accompanying file LICENSE_1_0.txt or a copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- // Home at http://www.boost.org/libs/config
- // MACRO: BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
- // TITLE: local classes as template parameters
- // DESCRIPTION: Local classes cannot be passed as template parameters.
- // NOTE: Local classes cannot be passed as template parameters in C++03 (even
- // if some C++03 compilers, like MSVC and older GCC, allow it). Local classes
- // can instead be passed as template parameters in C++11 (see also N2657, note
- // that this macro does not check if unnamed types can also be passed as
- // template parameters but it is intentionally limited to local named classes
- // because some non C++11 compilers might only support local named classes as
- // template parameters which is still very useful to program local functors).
- namespace boost_no_cxx11_local_class_template_parameters {
- template<typename T> struct a { void use() {} };
- template<typename T> void f(T) {}
- int test() {
- class local_class {} local_obj;
- a<local_class> a1;
- a1.use(); // Avoid unused variable warning.
- f(local_obj);
- return 0;
- }
- } // namespace
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