I''m trying to do something that I think ought be very simple... but I just don''t now enough about adaptors to understand what exactly I need to do. How do I use the STL adaptors to call a method on a range of iterators _and pass that method a parameter? This is my conventional loop...

  
vector<udpPacket> m_RecvPacketPool(32);
m_RecvPacketPool.resize(32);

for(int i=0; i<100; ++i)
	m_RecvPacketPool[i].Alloc(2048);
  

...that I''d like to replace with an STL for_each function These are my feable attemps:

  
for_each(m_RecvPacketPool.begin(), m_RecvPacketPool.end(), mem_fun1_ref(udpPacket::Alloc, 2048));

for_each(vRecvPacketPool.begin(), vRecvPacketPool.end(), bind1st(mem_fun1_ref(udpPacket::Alloc), 2048));

for_each(vRecvPacketPool.begin(), vRecvPacketPool.end(), bind2nd(mem_fun1_ref(udpPacket::Alloc), 2048));

  

neither of which work (MSVC6 with the built-in STL) Here''s the diagnostic mess:

quote: c:\program files\microsoft\visual studio 6\vc98\include\algorithm(37) : error C2664: ''()'' : cannot convert parameter 1 from ''struct I3D::Socket::udpPacket'' to ''const unsigned int &'' Reason: cannot convert from ''struct I3D::Socket::udpPacket'' to ''const unsigned int'' No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called E:\Projects\MSVC\SocketTest\SocketTestDlg.cpp(77) : see reference to function template instantiation ''class std::binder1st > __cdecl std::for_each(struct I3D::Socket:: udpPacket *,struct I3D::Socket::udpPacket *,class std::binder1st >)'' being compiled c:\program files\microsoft\visual studio 6\vc98\include\algorithm(37) : error C2064: term does not evaluate to a function E:\Projects\MSVC\SocketTest\SocketTestDlg.cpp(77) : see reference to function template instantiation ''class std::binder1st > __cdecl std::for_each(struct I3D::Socket:: udpPacket *,struct I3D::Socket::udpPacket *,class std::binder1st >)'' being compiled

Here''s the signiture of the Alloc & Test methods:

  
int Alloc(u32 cBytes);
int Test();
  

This does work...

  
for_each(vRecvPacketPool.begin(), vRecvPacketPool.end(), mem_fun_ref(udpPacket::Test));
  

...it doesn''t do anything useful, but show that I figured out how to call a method with no parameters (And before some smart-ass drops the "search google" thing on me, there''s only two hits - one''s a post-script file and the other is in Japanese!) Magmai Kai Holmlor "Oh, like you''ve never written buggy code" - Lee "What I see is a system that _could do anything - but currently does nothing !" - Anonymous CEO

This is for an exist program built using MFC and is a delivered customer program... so I kinda want to stick to the same compiler and IDE. I did try out the STLport, but it fails as expected since the root problem is a compiler limitation.

  	#define FOR_EACH(begin, end, pred, iter)\		{\		iter it = begin;\		iter itEnd = end;\		for(;it!=itEnd; ++it)\			{\			it pred;\			}\		}FOR_EACH(m_RecvPacketPool.begin(), m_RecvPacketPool.end(), ->Alloc(2048), tyPacketPool::iterator);  

Crude but effective (pObject ->Method(); actually compiles - I tried it half figuring it wouldn''t)

Anyone see a way to determine the iterator type automatically?


...
gcc is a GNU program correct? Do you have to give away any/every program you write with it?

Magmai Kai Holmlor

"Oh, like you''ve never written buggy code" - Lee

"What I see is a system that _could do anything - but currently does nothing !" - Anonymous CEO