74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
// (C) Copyright John Maddock 2001.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/config for most recent version.
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// MACRO: BOOST_FUNCTION_SCOPE_USING_DECLARATION_BREAKS_ADL
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// TITLE: broken ADL
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// DESCRIPTION: Using declarations break argument dependent lookup
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// (probably Borland specific), the fix is to use
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// using namespace whatever; rather than
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// using whatever::symbol;.
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namespace boost_ns
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{
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template <class T>
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T* get_pointer(T* p)
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{ return p; }
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namespace inner2
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{
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template <class T>
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struct X {};
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template <class T>
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T* get_pointer(X<T>)
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{ return 0; }
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}
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}
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namespace user_ns
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{
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template <class T>
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struct Y{};
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template <class T>
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T* get_pointer(user_ns::Y<T>)
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{ return 0; }
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template <class T>
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int f(T x)
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{
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// use this as a workaround:
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//using namespace boost;
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// this statement breaks ADL:
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using boost_ns::get_pointer; // conforming compilers require
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// this one to find the auto_ptr
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// and T* overloads
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return get_pointer(x) == 0;
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}
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}
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namespace boost_function_scope_using_declaration_breaks_adl{
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int test()
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{
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int i;
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typedef void* pv;
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i = user_ns::f(pv());
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i = user_ns::f(boost_ns::inner2::X<int>());
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(void)i;
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return 0;
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}
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}
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