Large boost::multi_array Problem
Hi, I have the following problem, I make a boost::multi_array<float,2> of size X by X. I initialise this using the following line typedef boost::multi_array<float, 2> array_type; array_type D(boost::extents[num_vertices][num_vertices]); This works fine up to a size of 5000 x 5000 then my program crashes at the definition stage due to memory requirements. I am assuming the boost::extents call stops my program creating a multi array of a size bigger than 5000 x 5000. However in certain situations I need a bigger 2D array, any thoughts on how I can achieve this? Adam
I think boost::thread will beneficiate from a third constructor: thread::thread( boost::shared_ptr< boost::function0<void>& > ) 1. This constructor will allow to use functors that are heavy to copy or simply non - copiable. 2. This contructor will also allow polymorphic functors. For example, in the following code, the copying of the functor destroys its polymorphism (there is not any 2 printed in the output) : #include <boost/thread/thread.hpp> #include <iostream> class A { public: unsigned int m_a; A( unsigned int a_a ) : m_a( a_a ) {} void Begin() {boost::thread ( * this );} void operator ()() {foo(); std::cout << m_a;} virtual void foo() {m_a = 3; std::cout << m_a;} }; class B : public A { public: B( unsigned int a_a ) : A( a_a ) {} void foo() {m_a = 2; std::cout << m_a;} }; int main() { B b( 7 ); b.Begin(); std::cout << b.m_a; system("pause"); return 0; } ++Hector C. ---------------------------------- --------------------------------- New Yahoo! Messenger with Voice. Call regular phones from your PC and save big.
Calderon Hector wrote:
I think boost::thread will beneficiate from a third constructor:
thread::thread( boost::shared_ptr< boost::function0<void>& > )
1. This constructor will allow to use functors that are heavy to copy or simply non - copiable.
2. This contructor will also allow polymorphic functors. For example, in the following code, the copying of the functor destroys its polymorphism (there is not any 2 printed in the output) :
#include <boost/thread/thread.hpp> #include <iostream>
class A { public: unsigned int m_a;
A( unsigned int a_a ) : m_a( a_a ) {}
void Begin() {boost::thread ( * this );}
void operator ()() {foo(); std::cout << m_a;}
virtual void foo() {m_a = 3; std::cout << m_a;} };
Drop operator() and use boost::bind( &A::foo, shared_ptr<A>( new B ) ) as a thread proc.
Drop operator() and use boost::bind( &A::foo, shared_ptr( new B ) ) as a thread proc.
Thank you, it worked perfectly. ++Hector C. ---------------------------------- --------------------------------- Blab-away for as little as 1¢/min. Make PC-to-Phone Calls using Yahoo! Messenger with Voice.
Calderon Hector <hhcalderon@yahoo.com> writes:
I think boost::thread will beneficiate from a third constructor:
See http://www.boost.org/more/discussion_policy.htm#effective -- Dave Abrahams Boost Consulting www.boost-consulting.com
participants (4)
-
Adam Hartshorne -
Calderon Hector -
David Abrahams -
Peter Dimov