Re: [boost] [boost/foreach] What is wrong with BOOST_FOREACH(const std::string &name, m_modules)?

Subject: Re: [boost] [boost/foreach] What is wrong with BOOST_FOREACH(const std::string &name, m_modules)?
From: Sebastian Redl (sebastian.redl_at_[hidden])
Date: 2011-09-10 06:24:02

On 09.09.2011, at 20:00, Steven Watanabe wrote:

> AMDG
> 
> On 09/09/2011 10:40 AM, Eric Niebler wrote:
>> On 9/9/2011 1:31 PM, Steven Watanabe wrote:
>>> On 09/09/2011 09:51 AM, Demetrio Car wrote:
>>>> I am trying to compile this example
>>>> http://www.boost.org/doc/libs/1_42_0/doc/html/boost_propertytree/tutorial.html
>>>> and I am getting the error
>>>> "/usr/local/boost_1_47_0/boost/property_tree/detail/ptree_implementation.hpp:795:54:
>>>> error: request for member ‘put_value’ in ‘tr’, which is of non-class type
>>>> ‘bool’" in this line:
>>>>    BOOST_FOREACH(const std::string &name, m_modules){
>>>>        pt.put("debug.modules.module", name, true);
>>>>    }
>>>> 
>>>> My full error message is:
>>>> 
>>>> <snip>
>>>> 
>>> 
>>> I'd guess that this is a breaking change between
>>> 1.42 and 1.47.  I checked the documentation
>>> for 1.47 and the example has definitely changed.
>> 
>> Steven, a breaking change in what? Which example has changed? Where? Is
>> this a problem in BOOST_FOREACH or in property_tree?
>> 
> 
> It has to be in property_tree.  The error
> is inside property_tree, and m_modules is
> just a std::set<std::string>.

Basically, the bool-parameter version of put() no longer exists; there are now put() and add(). I can't remember what the boolean meant exactly, so I don't know which one is right for this situation.

The error happens because the third parameter is unconditionally interpreted as a translator object, which is why the function attempts to call put_value() on it.

Sebastian