Hello! I am new to the boost lambda library so this might be a naive question. Here goes. This is what I want to do: class Foo { public: int bar() { return 42; } }; int main() { std::vector<Foo> v; v.push_back(Foo()); count_if(v.begin(), v.end(), boost::bind(&Foo::bar, _1) == 42); return 0; } However, I get a comilation error when trying to compile this with g++ version 3.3.2: test.cpp: In function `int main()': test.cpp:17: error: no match for 'operator==' in '`empty_class_expr' not test.cpp:17: sorry, unimplemented: supported by dump_expr test.cpp:17: sorry, unimplemented: boost::bind(R (T::*)(), A1) [with R = int, T = Foo, A1 = boost::arg<1>]((<unnamed>::_1, <expression error>)) == 42' To me it seems that this is something that I should be able to do with the BLL. If someone could point me in the right direction here I would be really greatful! Thanks in advance! Regards, Mattias
Hello Mattias,
Wednesday, July 28, 2004, 6:19:21 PM, you wrote:
MB> Hello!
MB> I am new to the boost lambda library so this might be a naive question.
MB> Here goes. This is what I want to do:
MB> class Foo {
MB> public:
MB> int bar() { return 42; }
MB> };
MB> int main()
MB> {
MB> std::vector<Foo> v;
MB> v.push_back(Foo());
MB> count_if(v.begin(), v.end(), boost::bind(&Foo::bar, _1) == 42);
MB> return 0;
MB> }
You may try something like this:
#include <vector>
#include
On Wed, 28 Jul 2004 16:19:21 +0200, Mattias Brändström wrote:
To me it seems that this is something that I should be able to do with the BLL. If someone could point me in the right direction here I would be really greatful!
Hi,
You're almost there. The problem is that you're using boost::bind
instead of boost::lambda::bind. I think that boost::bind is more
portable, but it doesn't support lambda expressions. Here's a working
version of your code:
#include <algorithm>
#include <vector>
#include
participants (3)
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Daniel James -
Mattias Brändström -
Владимир Красовский