Re: [Boost-users] Using boost bind library to loop thru a list

Rearranged reply: Meryl Silverburgh wrote:

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Meryl Silverburgh wrote:

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Thanks how can I call a function with 2 more parameters, like this: How can I pass 'param1', 'param2' to the fuction doStuff?

void A::aFunction( float param1, float param2) {

vector<int> aVector; aVector.push_back(1); aVector.push_back(2); aVector.push_back(3); aVector.push_back(4);

// want to loop thru the list and call A::print(int i, float param1, float param2)?

for_each( aVector.begin(), aVector.end(), bind( &A::doStuff, this, _1, param1, param2 ) );

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}

void A::doStuff(int i, float param1, float param2) {

} Thanks. One more question, why the function 'doStuff' has to be 'public' otherwise, it won't compile? In my example, aFunction is a member function of 'A', so I can put 'doStuff' as private, right? but

On 2/16/06, Peter Dimov wrote: that won't compile.

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for_each( aVector.begin(), aVector.end(), bind( &A::doStuff, this, _1, param1, param2 ) );

Can someone please tell me why?

Not sure what your exactly asking here. for_each is expecting to call a function f( value_type& ), where in this case value type is an int. for_each call this function f for each derefrenced iterator in the sequence v.begin() to v.end(). The bind call above returns such a function, mapping the int in f, to the placeholder in the call to A::doStuff. The assumption is made that A is a class rather than a name space, since you didn't post a complete example. So that makes A::doStuff a member function. Member functions take a this pointer as their hidden 1st argument. A::aFunction is assumed to be a member function as well so the this pointer is available. bind( &A::doStuff // an A member function , this // this instance of A's this pointer , _1 // the derefenced vector::iterator (an int ) , param1 // the 1st float arg value , param2 // the 2nd float arg value ) Jeff Flinn