Re: [Boost-users] [Container] ptr_set with user define compare function

Subject: Re: [Boost-users] [Container] ptr_set with user define compare function
From: ÁºÉÜ³Ø (shaochiliang_at_[hidden])
Date: 2009-05-22 22:38:47

Hello, Steven
Your test case is failed in my environment. I use boost 1.36.0

then I replaced my boost with 1.39.0 and found it works!

What's the difference between them?

2009/5/23 Steven Watanabe <watanabesj_at_[hidden]>

> AMDG
>
> ÁºÉÜ³Ø wrote:
>
>> I've defined a function object as below:
>>
>>  struct BaseAddrLess : public std::binary_function<Base, Base, bool>  {
>>        result_type operator() (const first_argument_type& lhs, const
>> second_argument_type& rhs) const  {
>>              return &lhs < &rhs;
>>        }
>>  };
>>
>> and use as a compare function in ptr_set like this:
>>   ptr_set<Base, BaseAddrLess> bset;
>>
>> when the class Base is a abstract class the vc9 compiler will complain
>>  use of undefined type 'boost::result_of<F>'
>>
>> What causes this problem? How to solve it?
>>
>>
>
> Works for me.
> Do you have a minimal test case that fails?
> What version of Boost are you using?
>
> #include <functional>
> #include <boost/ptr_container/ptr_set.hpp>
>
> struct Base {
> virtual ~Base() = 0;
> };
>
> Base::~Base() {}
>
> struct Derived : Base {};
>
> struct BaseAddrLess : public std::binary_function<Base, Base, bool> {
> result_type operator() (
> const first_argument_type& lhs,
> const second_argument_type& rhs) const {
> return &lhs < &rhs;
> }
> };
>
> int main() {
> boost::ptr_set<Base, BaseAddrLess> bset;
> bset.insert(new Derived());
> }
>
> In Christ,
> Steven Watanabe
>
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