Re: [Boost-users] [Lambda, Function, etc] Is static dangerous?

Subject: Re: [Boost-users] [Lambda, Function, etc] Is static dangerous?
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2011-05-23 09:40:06

AMDG

On 05/23/2011 05:52 AM, Robert Jones wrote:
> Hi All
> 
> Is it dangerous to write static Boost.Functions or Boost.Lamda placeholders
> in a multi-theaded
> context? I think that might be a really stoopid quesion - I'm just checking!
> 

In C++03, local static anything is dangerous,
because the initialization is not guaranteed
to be thread safe.  It's safe in C++0x and
both Boost.Function and Boost.Lambda are
safe with parallel reads.

> eg,
> 
> #include <boost/function.hpp>
> #include <boost/lambda/bind.hpp>
> 
> 
> void f( )
> {
>     namespace ll = boost::lambda;
>     using boost::function;
> 
>     typedef std::pair<int, int> int_pair;
> 
>     static ll::placeholder1_type x;
>     static function<int(const int_pair &)> second = ll::bind( &
> int_pair::second, x );
> }
> 

In Christ,
Steven Watanabe