Re: [Boost-users] Compile error using boost's tr1::bind

Subject: Re: [Boost-users] Compile error using boost's tr1::bind
From: Peter Dimov (pdimov_at_[hidden])
Date: 2009-06-04 10:10:43

Tron Thomas:
...

> int main()
> {
>     Value sum;
>     int values[] = { 1, 2, 3, 4, 5 };
>     std::for_each(values, values + 5, std::tr1::bind(&Value::IncreaseBy, 
> sum));
>     std::cout << "The value is " << sum << std::endl;
>     return 0;
> }

You need to use

    std::for_each(values, values + 5, std::tr1::bind(&Value::IncreaseBy, 
&sum, _1));

&sum (or, if you prefer, std::tr1::ref(sum)) is needed so that bind doesn't 
make a copy of sum. The _1 is needed to receive the number from values and 
pass it to IncreaseBy as the 'amount'.