Re: [Boost-users] [BLL] Problem with print vector elements.

Subject: Re: [Boost-users] [BLL] Problem with print vector elements.
From: mik (mirko.cambi_at_[hidden])
Date: 2012-04-12 05:54:41

Hi Thomas,

You're right, I've just changed the include from boost/bind.hpp to
boost/lambda/bind.hpp and now works perfectly.

thank you,

 Mirko

**

On Thu, Apr 12, 2012 at 11:50, Thomas Heller <thom.heller_at_[hidden]>wrote:

> On 04/12/2012 11:06 AM, mik wrote:
>
>> Hi,
>>
>> I'm trying to use thew BLL for the first time and I've the following
>> program:
>>
>> class Date
>> {
>> public:
>>    Date(long d): _lDate(d) {}
>>    long getDate() const { return _lDate; }
>>    [...]
>> private:
>>    long _lDate;
>> };
>>
>> std::ostream&  operator<<(std::ostream&s, const Date&x)
>> {
>>    [...]
>> }
>>
>> struct C
>> {
>>    C(long d): date(d) {}
>>    Date date;
>> };
>>
>> int main()
>> {
>>    const C c(46000);
>>    std::cout<<  boost::bind(&C::date, boost::lambda::_1)(c)<<  std::endl;
>>
>>    std::vector<C>  cont(1, C(46000));
>>    std::for_each(cont.begin(), cont.end(), std::cout<<
>> boost::bind(&C::date, boost::lambda::_1));
>>
>>    return 0;
>> }
>>
>> The first std::cout is ok. But for the second one nested int the for_each
>> I
>> get this message error:
>>
>> error C2679: binary '<<' : no operator found which takes a right-hand
>> operand of type 'boost::_bi::bind_t<R,F,L>' (or there is no acceptable
>> conversion)
>> with
>> [
>>    R=const Date&,
>>    F=boost::_mfi::dm<Date,C>,
>>    L=boost::_bi::list1<boost::**arg<1>>
>> ]
>> C:\Program Files (x86)\Microsoft Visual Studio
>> 9.0\VC\INCLUDE\ostream(653):
>> could be 'std::basic_ostream<_Elem,_**Traits>  &std::operator
>> <<<char,std::char_traits<char>**>(std::basic_ostream<_Elem,_**Traits>
>>  &,const
>> char *)' [found using argument-dependent lookup]
>> with
>> [
>>    _Elem=char,
>>    _Traits=std::char_traits<char>
>> ]
>>
>> Can you help me?
>>
>
> To be honest, I am surprised that the first cout expression works.
> Boost.Lambda placeholders don't match well with Boost.Bind.
> If you meant boost::lambda::bind instead of boost::bind, the for_each
> should work, assuming you included the header defining the operator
> overloads for BLL expressions.
> Assuming that you really meant boost::bind, and instead of ::_1 you
> accidently wrote boost::lambda::_1, you are in trouble. Boost.Bind only
> overloads the following operators:  !, ==, !=, <, <=, >, >=, &&, ||. Which
> is the reason your program didn't compile.
> If you have more problems, please provide a complete testcase (i.e. with
> includes etc.)
>
>
>> Thank you,
>>     Mirko
>>
>>
>> **
>>
>>
>>
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>>
>
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