[boost] [Boost-bugs] [ boost-Bugs-1567821 ] Const correctness violation

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-09-29 11:30:55

Bugs item #1567821, was opened at 2006-09-29 11:30
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Category: function
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Douglas Gregor (dgregor)
Assigned to: Douglas Gregor (dgregor)
Summary: Const correctness violation

Initial Comment:

Boost.Function does not preserve const correctness for reference 
wrappers
e.g.

class function_object_type {
  public:
    void operator()() const {}
};

void f() {
    const function_object_type const_function_object;
    boost::function<void()> function(boost::ref(const_function_object));
    assert(function.target<function_object>() == 
&const_function_object);   //const lost
}

I can see two possible solutions for this:

    add a flag:
    enum cv_qualifiers { const_ = 1, volatile_ = 1 << 1};

    or don't unwrap references for target:
    function.target<boost::reference_wrapper<function_object> >()

The first method seems preferable because it doesn't
require the interface to change.

In Christ,
Steven Watanabe

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