New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/drape_frontend/map_data_provider.cpp

@@ -0,0 +1,40 @@
+#include "drape_frontend/map_data_provider.hpp"
+
+#include "base/assert.hpp"
+
+#include <utility>
+
+namespace df
+{
+MapDataProvider::MapDataProvider(TReadIDsFn && idsReader,
+                                 TReadFeaturesFn && featureReader,
+                                 TIsCountryLoadedByNameFn && isCountryLoadedByNameFn,
+                                 TUpdateCurrentCountryFn && updateCurrentCountryFn)
+  : m_isCountryLoadedByName(std::move(isCountryLoadedByNameFn))
+  , m_featureReader(std::move(featureReader))
+  , m_idsReader(std::move(idsReader))
+  , m_updateCurrentCountry(std::move(updateCurrentCountryFn))
+{
+  CHECK(m_isCountryLoadedByName != nullptr, ());
+  CHECK(m_featureReader != nullptr, ());
+  CHECK(m_idsReader != nullptr, ());
+  CHECK(m_updateCurrentCountry != nullptr, ());
+}
+
+void MapDataProvider::ReadFeaturesID(TReadCallback<FeatureID const> const & fn, m2::RectD const & r,
+                                     int scale) const
+{
+  m_idsReader(fn, r, scale);
+}
+
+void MapDataProvider::ReadFeatures(TReadCallback<FeatureType> const & fn,
+                                   std::vector<FeatureID> const & ids) const
+{
+  m_featureReader(fn, ids);
+}
+
+MapDataProvider::TUpdateCurrentCountryFn const & MapDataProvider::UpdateCurrentCountryFn() const
+{
+  return m_updateCurrentCountry;
+}
+}  // namespace df