I ended up using boost::bind() anyway lol.

Tick is a function called in my game every frame. Tick takes a float because my game uses seconds as delta time. 1.0f is 1 second, 0.5f is half a second and so on.

Thanks for your help.

On Nov 27, 2007 4:21 PM, Bill Buklis <boostuser@pbjzone.com> wrote:

I can't figure out how to use std::mem_fun() and std::bind1st() with std::for_each() to call into a member function for each element in a boost::ptr_vector object. Some sample code below:

class Object
{
public:
    void Tick( float number ) {}
};

boost::ptr_vector<Object> m_objects;
using namespace std;
for_each( m_objects.begin(), m_objects.end(), bind1st( mem_fun( &Object::Tick ), 5 ) );


Of course, this doesn't compile at all. Can anyone tell me what I'm doing wrong?

 

Try using boost::bind. It makes life so much simpler. Once I discovered that I never used bind1st, mem_fun, etc. again. I believe this is included in TR1 anyway.

 

for_each( m_objects.begin(), m_objects.end(), boost::bind(&Object::Tick, _1, 5.0) );

 

Although, this may give you a warning about converting a double to a float. Why is Tick defined to take a float anyway?

 

 

-- Bill --

 


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