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#ifndef HERA_BT_DNN_UTILS_H
#define HERA_BT_DNN_UTILS_H
#include <boost/random/uniform_int.hpp>
#include <boost/foreach.hpp>
#include <boost/typeof/typeof.hpp>
namespace hera
{
namespace bt
{
namespace dnn
{
template <typename T, typename... Args>
struct has_coordinates
{
template <typename C, typename = decltype( std::declval<C>().coordinate(std::declval<Args>()...) )>
static std::true_type test(int);
template <typename C>
static std::false_type test(...);
static constexpr bool value = decltype(test<T>(0))::value;
};
template<class RandomIt, class UniformRandomNumberGenerator, class SwapFunctor>
void random_shuffle(RandomIt first, RandomIt last, UniformRandomNumberGenerator& g, const SwapFunctor& swap)
{
size_t n = last - first;
boost::uniform_int<size_t> uniform(0,n);
for (size_t i = n-1; i > 0; --i)
swap(first[i], first[uniform(g,i+1)]); // picks a random number in [0,i] range
}
template<class RandomIt, class UniformRandomNumberGenerator>
void random_shuffle(RandomIt first, RandomIt last, UniformRandomNumberGenerator& g)
{
typedef decltype(*first) T;
random_shuffle(first, last, g, [](T& x, T& y) { std::swap(x,y); });
}
} // dnn
} // bt
} // hera
#endif
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