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Use explicit operator bool when available; add nullptr support to shared_ptr. Refs #4116.

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[SVN r81780]
This commit is contained in:
Peter Dimov
2012-12-08 00:51:59 +00:00
parent 7a4ad75f5d
commit 8093967da7
9 changed files with 386 additions and 3 deletions
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11
include/boost/smart_ptr/detail/operator_bool.hpp
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@ -1,12 +1,19 @@
// This header intentionally has no include guards.
//
// Copyright (c) 2001-2009 Peter Dimov
// Copyright (c) 2001-2009, 2012 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#if ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570) ) || defined(__CINT__)
#if !defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) && !defined( BOOST_NO_CXX11_NULLPTR )
explicit operator bool () const BOOST_NOEXCEPT
{
return px != 0;
}
#elif ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570) ) || defined(__CINT__)
operator bool () const BOOST_NOEXCEPT
{

24
include/boost/smart_ptr/intrusive_ptr.hpp
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@ -218,6 +218,30 @@ template<class T> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_p
#endif
#if !defined( BOOST_NO_CXX11_NULLPTR )
template<class T> inline bool operator==( intrusive_ptr<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator==( std::nullptr_t, intrusive_ptr<T> const & p ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator!=( intrusive_ptr<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
template<class T> inline bool operator!=( std::nullptr_t, intrusive_ptr<T> const & p ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
#endif
template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
{
return std::less<T *>()(a.get(), b.get());

25
include/boost/smart_ptr/scoped_array.hpp
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@ -11,6 +11,7 @@
// http://www.boost.org/libs/smart_ptr/scoped_array.htm
//
#include <boost/config.hpp>
#include <boost/assert.hpp>
#include <boost/checked_delete.hpp>
#include <boost/config.hpp> // in case ptrdiff_t not in std
@ -97,6 +98,30 @@ public:
}
};
#if !defined( BOOST_NO_CXX11_NULLPTR )
template<class T> inline bool operator==( scoped_array<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator==( std::nullptr_t, scoped_array<T> const & p ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator!=( scoped_array<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
template<class T> inline bool operator!=( std::nullptr_t, scoped_array<T> const & p ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
#endif
template<class T> inline void swap(scoped_array<T> & a, scoped_array<T> & b) BOOST_NOEXCEPT
{
a.swap(b);

25
include/boost/smart_ptr/scoped_ptr.hpp
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@ -11,6 +11,7 @@
// http://www.boost.org/libs/smart_ptr/scoped_ptr.htm
//
#include <boost/config.hpp>
#include <boost/assert.hpp>
#include <boost/checked_delete.hpp>
#include <boost/detail/workaround.hpp>
@ -114,6 +115,30 @@ public:
}
};
#if !defined( BOOST_NO_CXX11_NULLPTR )
template<class T> inline bool operator==( scoped_ptr<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator==( std::nullptr_t, scoped_ptr<T> const & p ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator!=( scoped_ptr<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
template<class T> inline bool operator!=( std::nullptr_t, scoped_ptr<T> const & p ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
#endif
template<class T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) BOOST_NOEXCEPT
{
a.swap(b);

24
include/boost/smart_ptr/shared_array.hpp
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@ -243,6 +243,30 @@ template<class T> inline bool operator!=(shared_array<T> const & a, shared_array
return a.get() != b.get();
}
#if !defined( BOOST_NO_CXX11_NULLPTR )
template<class T> inline bool operator==( shared_array<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator==( std::nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator!=( shared_array<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
template<class T> inline bool operator!=( std::nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
#endif
template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
{
return std::less<T*>()(a.get(), b.get());

60
include/boost/smart_ptr/shared_ptr.hpp
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@ -41,7 +41,7 @@
#include <algorithm> // for std::swap
#include <functional> // for std::less
#include <typeinfo> // for std::bad_cast
#include <cstddef> // for std::size_t
#include <cstddef> // for std::size_t, std::nullptr_t
#if !defined(BOOST_NO_IOSTREAM)
#if !defined(BOOST_NO_IOSFWD)
@ -339,6 +339,14 @@ public:
{
}
#if !defined( BOOST_NO_CXX11_NULLPTR )
shared_ptr( std::nullptr_t ) BOOST_NOEXCEPT : px( 0 ), pn() // never throws
{
}
#endif
template<class Y>
explicit shared_ptr( Y * p ): px( p ), pn() // Y must be complete
{
@ -356,6 +364,14 @@ public:
boost::detail::sp_deleter_construct( this, p );
}
#if !defined( BOOST_NO_CXX11_NULLPTR )
template<class D> shared_ptr( std::nullptr_t p, D d ): px( p ), pn( p, d )
{
}
#endif
// As above, but with allocator. A's copy constructor shall not throw.
template<class Y, class D, class A> shared_ptr( Y * p, D d, A a ): px( p ), pn( p, d, a )
@ -363,6 +379,14 @@ public:
boost::detail::sp_deleter_construct( this, p );
}
#if !defined( BOOST_NO_CXX11_NULLPTR )
template<class D, class A> shared_ptr( std::nullptr_t p, D d, A a ): px( p ), pn( p, d, a )
{
}
#endif
// generated copy constructor, destructor are fine...
#if defined( BOOST_HAS_RVALUE_REFS )
@ -577,6 +601,16 @@ public:
return *this;
}
#endif
#if !defined( BOOST_NO_CXX11_NULLPTR )
shared_ptr & operator=( std::nullptr_t ) BOOST_NOEXCEPT // never throws
{
this_type().swap(*this);
return *this;
}
#endif
void reset() BOOST_NOEXCEPT // never throws in 1.30+
@ -711,6 +745,30 @@ template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T>
#endif
#if !defined( BOOST_NO_CXX11_NULLPTR )
template<class T> inline bool operator==( shared_ptr<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator==( std::nullptr_t, shared_ptr<T> const & p ) BOOST_NOEXCEPT
{
return p.get() == 0;
}
template<class T> inline bool operator!=( shared_ptr<T> const & p, std::nullptr_t ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
template<class T> inline bool operator!=( std::nullptr_t, shared_ptr<T> const & p ) BOOST_NOEXCEPT
{
return p.get() != 0;
}
#endif
template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b) BOOST_NOEXCEPT
{
return a.owner_before( b );

2
test/Jamfile.v2
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@ -75,6 +75,8 @@ import testing ;
[ run sp_convertible_test.cpp ]
[ run sp_array_n_test.cpp ]
[ run sp_array_cast_test.cpp ]
[ run sp_zero_compare_test.cpp ]
[ run sp_nullptr_test.cpp ]
[ compile-fail array_fail_spa_sp_c.cpp ]
[ compile-fail array_fail_sp_spa_c.cpp ]

140
test/sp_nullptr_test.cpp Normal file
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@ -0,0 +1,140 @@
//
// sp_nullptr_test.cpp
//
// Copyright 2012 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/shared_ptr.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <cstddef>
#include <memory>
#if !defined( BOOST_NO_CXX11_NULLPTR )
struct X
{
static int instances;
X()
{
++instances;
}
~X()
{
--instances;
}
private:
X( X const & );
X & operator=( X const & );
};
int X::instances = 0;
void f( std::nullptr_t )
{
}
int main()
{
{
boost::shared_ptr<void> p( nullptr );
BOOST_TEST( p.get() == 0 );
BOOST_TEST( p.use_count() == 0 );
BOOST_TEST( p == nullptr );
BOOST_TEST( nullptr == p );
BOOST_TEST( !( p != nullptr ) );
BOOST_TEST( !( nullptr != p ) );
}
{
boost::shared_ptr<int> p( nullptr, f );
BOOST_TEST( p.get() == 0 );
BOOST_TEST( p.use_count() == 1 );
BOOST_TEST( p == nullptr );
BOOST_TEST( nullptr == p );
BOOST_TEST( !( p != nullptr ) );
BOOST_TEST( !( nullptr != p ) );
}
{
boost::shared_ptr<int> p( nullptr, f, std::allocator<int>() );
BOOST_TEST( p.get() == 0 );
BOOST_TEST( p.use_count() == 1 );
BOOST_TEST( p == nullptr );
BOOST_TEST( nullptr == p );
BOOST_TEST( !( p != nullptr ) );
BOOST_TEST( !( nullptr != p ) );
}
{
boost::shared_ptr<int> p( new int );
BOOST_TEST( p.get() != 0 );
BOOST_TEST( p.use_count() == 1 );
BOOST_TEST( p != nullptr );
BOOST_TEST( nullptr != p );
BOOST_TEST( !( p == nullptr ) );
BOOST_TEST( !( nullptr == p ) );
p = nullptr;
BOOST_TEST( p.get() == 0 );
BOOST_TEST( p.use_count() == 0 );
BOOST_TEST( p == nullptr );
BOOST_TEST( nullptr == p );
BOOST_TEST( !( p != nullptr ) );
BOOST_TEST( !( nullptr != p ) );
}
{
BOOST_TEST( X::instances == 0 );
boost::shared_ptr<X> p( new X );
BOOST_TEST( X::instances == 1 );
BOOST_TEST( p.get() != 0 );
BOOST_TEST( p.use_count() == 1 );
BOOST_TEST( p != nullptr );
BOOST_TEST( nullptr != p );
BOOST_TEST( !( p == nullptr ) );
BOOST_TEST( !( nullptr == p ) );
p = nullptr;
BOOST_TEST( X::instances == 0 );
BOOST_TEST( p.get() == 0 );
BOOST_TEST( p.use_count() == 0 );
BOOST_TEST( p == nullptr );
BOOST_TEST( nullptr == p );
BOOST_TEST( !( p != nullptr ) );
BOOST_TEST( !( nullptr != p ) );
}
return boost::report_errors();
}
#else
int main()
{
return 0;
}
#endif

78
test/sp_zero_compare_test.cpp Normal file
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@ -0,0 +1,78 @@
//
// sp_zero_compare_test.cpp - == 0, != 0
//
// Copyright 2012 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/scoped_ptr.hpp>
#include <boost/scoped_array.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/shared_array.hpp>
#include <boost/intrusive_ptr.hpp>
#include <boost/detail/lightweight_test.hpp>
struct W
{
};
void intrusive_ptr_add_ref( W* )
{
}
void intrusive_ptr_release( W* )
{
}
int main()
{
{
boost::scoped_ptr<int> p;
BOOST_TEST( p == 0 );
BOOST_TEST( 0 == p );
BOOST_TEST( !( p != 0 ) );
BOOST_TEST( !( 0 != p ) );
}
{
boost::scoped_array<int> p;
BOOST_TEST( p == 0 );
BOOST_TEST( 0 == p );
BOOST_TEST( !( p != 0 ) );
BOOST_TEST( !( 0 != p ) );
}
{
boost::shared_ptr<int> p;
BOOST_TEST( p == 0 );
BOOST_TEST( 0 == p );
BOOST_TEST( !( p != 0 ) );
BOOST_TEST( !( 0 != p ) );
}
{
boost::shared_array<int> p;
BOOST_TEST( p == 0 );
BOOST_TEST( 0 == p );
BOOST_TEST( !( p != 0 ) );
BOOST_TEST( !( 0 != p ) );
}
{
boost::intrusive_ptr<W> p;
BOOST_TEST( p == 0 );
BOOST_TEST( 0 == p );
BOOST_TEST( !( p != 0 ) );
BOOST_TEST( !( 0 != p ) );
}
return boost::report_errors();
}