C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Comprehensive treatment of new / delete          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Dave Guest Posted: Mon Jul 18, 2005 3:32 pm    Post subject: Comprehensive treatment of new / delete Hello all, I'd like to find a source on the web that discusses, in a comprehensive manner and in one place, everything about new / delete. It should include overloading operator new, the new operator, placement, nothrow, arrays, etc... My books cover the topic, I've found FAQs on the web that cover the topic, and so on, but all the sources I've found are disjointed. There's a bit on this page, a bit on that page, and so on. The information may all be there, but it's kind of hard to piece it all together. If anybody knows of an article out there that gives a comprehensive treatment of this topic in one place, I'd appreciate a link. Thanks, Dave Back to top Gianni Mariani Guest Posted: Mon Jul 18, 2005 4:17 pm    Post subject: Re: Comprehensive treatment of new / delete Dave wrote: Quote: Hello all, I'd like to find a source on the web that discusses, in a comprehensive manner and in one place, everything about new / delete. It should include overloading operator new, the new operator, placement, nothrow, arrays, etc... My books cover the topic, I've found FAQs on the web that cover the topic, and so on, but all the sources I've found are disjointed. There's a bit on this page, a bit on that page, and so on. The information may all be there, but it's kind of hard to piece it all together. If anybody knows of an article out there that gives a comprehensive treatment of this topic in one place, I'd appreciate a link. I don't know of one but let's see if we can make one ! http://www.google.com/search?q=new+delete&btnG=Search+the+C%2B%2B+FAQ&sitesearch=www.parashift.com That will give you a fairly detailed treatment of the topic. The code below covers most of the new/delete usages I have used. ------------------------------------------------------------------------ #include <unistd.h> #include <cstring> // non-portable but non-allocating write method void Write( const char * l_str ) { ::write( 1, l_str, std::strlen( l_str ) ); ::write( 1, "n", 1 ); } #include <new> #include <cstdlib> inline void * operator new ( size_t i_val ) { Write( "new called" ); void * l_ptr = std::malloc( i_val ); return l_ptr; } inline void operator delete ( void * i_ptr ) { Write( "delete called" ); if ( i_ptr ) { std::free( i_ptr ); } } struct A { A() { Write( "A contructed" ); } ~A() { Write( "A destructed" ); } }; template <typename X> void test1() { X * l_a = new X; delete l_a; X * l_b = new X[3]; delete [] l_b; } // This does not seem to be called - no matter what inline void operator delete ( void * i_ptr, size_t i_val ) { Write( "delete (with size) called" ); if ( i_ptr ) { std::free( i_ptr ); } } template <typename X> void test2() { X * l_a = new X; delete l_a; X * l_b = new X[3]; delete [] l_b; } struct B { inline void * operator new ( size_t i_val ) { Write( "B::new called" ); void * l_ptr = std::malloc( i_val ); return l_ptr; } inline void operator delete ( void * i_ptr ) { Write( "B::delete (with size) called" ); if ( i_ptr ) { std::free( i_ptr ); } } B() { Write( "B contructed" ); } ~B() { Write( "B destructed" ); } }; struct C { inline void * operator new ( size_t i_val ) { Write( "C::new called" ); void * l_ptr = std::malloc( i_val ); return l_ptr; } inline void * operator new ( size_t i_val, void * i_ptr ) { Write( "C::new placement new called" ); return i_ptr; } inline void operator delete ( void * i_ptr, size_t i_val ) { Write( "C::delete (with size) called" ); if ( i_ptr ) { std::free( i_ptr ); } } C() { Write( "C contructed" ); } ~C() { Write( "C destructed" ); } }; template <typename X> void test3() { long x[ ( sizeof( long ) + sizeof( X ) -1 )/sizeof( long ) ]; X * l_x = new ( ( void * ) x ) X; l_x->~X(); } int main() { Write( "ntest1<A>" ); test1<A>(); Write( "ntest2<A>" ); test2<A>(); Write( "ntest1<B>" ); test1<B>(); Write( "ntest1<C>" ); test1<C>(); Write( "ntest3<A>" ); test3<A>(); Write( "ntest3<C>" ); test3<C>(); } -------- output ---------- ../new_del test1<A> new called A contructed A destructed delete called new called A contructed A contructed A contructed A destructed A destructed A destructed delete called test2<A> new called A contructed A destructed delete called new called A contructed A contructed A contructed A destructed A destructed A destructed delete called test1<B> B::new called B contructed B destructed B::delete (with size) called new called B contructed B contructed B contructed B destructed B destructed B destructed delete called test1<C> C::new called C contructed C destructed C::delete (with size) called new called C contructed C contructed C contructed C destructed C destructed C destructed delete called test3<A> A contructed A destructed test3<C> C::new placement new called C contructed C destructed Back to top Alex Vinokur Guest Posted: Tue Aug 02, 2005 4:10 am    Post subject: Re: Comprehensive treatment of new / delete Dave wrote: Quote: Hello all, I'd like to find a source on the web that discusses, in a comprehensive manner and in one place, everything about new / delete. It should include overloading operator new, the new operator, placement, nothrow, arrays, etc... [snip] If anybody knows of an article out there that gives a comprehensive treatment of this topic in one place, I'd appreciate a link. Thanks, Dave Some samples with 'new' http://groups.google.com/group/comp.lang.c++/msg/432c7f9231d4b03b -- Alex Vinokur email: alex DOT vinokur AT gmail DOT com http://mathforum.org/library/view/10978.html http://sourceforge.net/users/alexvn Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.