exercise-4-5.hpp

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// ===-- chapter-4/exercise-4-5.hpp ----------------------- -*- C++ -*- --=== //
#ifndef EXERCISE_4_5
#define EXERCISE_4_5
 
#include <algorithm>
 
#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_const.hpp>
 
 
namespace exercise_4_5 {
 
// I don't think eval_if buys you anything here, and you'd have to wrap the
// Container iterator types with boost::mpl::identity<T> in the "return" cases.
// The downside is that Container must have both const_iterator and iterator
// typedefs defined.
template <typename Container, typename Value>
typename boost::mpl::if_<
    boost::is_const<Container>,
    typename Container::const_iterator,
    typename Container::iterator>::type
container_find(Container& c, Value const& v)
{
    return std::find(c.begin(), c.end(), v);
}
 
} // namespace exercise_4_5
 
#endif // EXERCISE_4_5