Fix operator<< for shared_ptr and intrusive_ptr. Fixes #115.

include/boost/smart_ptr/intrusive_ptr.hpp

@@ -285,7 +285,7 @@ template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast( intrusive_ptr<
 
 // operator<<
 
-template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p)
+template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p)
 {
     os << p.get();
     return os;

include/boost/smart_ptr/shared_ptr.hpp

@@ -775,7 +775,7 @@ template<class T> inline typename shared_ptr<T>::element_type * get_pointer(shar
 
 // operator<<
 
-template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
+template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
 {
     os << p.get();
     return os;

test/Jamfile

@@ -424,3 +424,7 @@ run sp_is_bounded_array_test.cpp ;
 run sp_is_unbounded_array_test.cpp ;
 run sp_type_identity_test.cpp ;
 run sp_type_with_alignment_test.cpp ;
+
+run sp_ostream_test.cpp ;
+run ip_ostream_test.cpp ;
+run lsp_ostream_test.cpp ;

test/ip_ostream_test.cpp

@@ -0,0 +1,75 @@
+// Copyright 2011, 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/intrusive_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+class base
+{
+private:
+
+    int use_count_;
+
+    base(base const &);
+    base & operator=(base const &);
+
+protected:
+
+    base(): use_count_(0)
+    {
+    }
+
+    virtual ~base()
+    {
+    }
+
+public:
+
+    long use_count() const
+    {
+        return use_count_;
+    }
+
+    inline friend void intrusive_ptr_add_ref(base * p)
+    {
+        ++p->use_count_;
+    }
+
+    inline friend void intrusive_ptr_release(base * p)
+    {
+        if(--p->use_count_ == 0) delete p;
+    }
+};
+
+struct X: public base
+{
+};
+
+template<class T> std::string to_string( T const& t )
+{
+    std::ostringstream os;
+    os << t;
+    return os.str();
+}
+
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
+int main()
+{
+    boost::intrusive_ptr<X> p1, p2( new X );
+
+    BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
+    BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
+
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
+    return boost::report_errors();
+}

test/lsp_ostream_test.cpp

@@ -0,0 +1,34 @@
+// Copyright 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/smart_ptr/local_shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+template<class T> std::string to_string( T const& t )
+{
+    std::ostringstream os;
+    os << t;
+    return os.str();
+}
+
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
+int main()
+{
+    boost::local_shared_ptr<int> p1, p2( new int );
+
+    BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
+    BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
+
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
+    return boost::report_errors();
+}

test/sp_ostream_test.cpp

@@ -0,0 +1,34 @@
+// Copyright 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+template<class T> std::string to_string( T const& t )
+{
+    std::ostringstream os;
+    os << t;
+    return os.str();
+}
+
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
+int main()
+{
+    boost::shared_ptr<int> p1, p2( new int );
+
+    BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
+    BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
+
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
+    return boost::report_errors();
+}