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