app/layers: consolidate signed/unsigned usage

* Also make use of optional's operator* where appropriate.

Signed-off-by: Marcus Fritzsch <marcus_fritzsch@mentor.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/layers.hpp b/src/layers.hpp
index 0601614..ee32054 100644
--- a/src/layers.hpp
+++ b/src/layers.hpp
@@ -71,9 +71,9 @@ struct layer_map {
    using json = nlohmann::json;
 
    using storage_type = std::set<struct layer>;
-   using layers_type = std::vector<unsigned int>;
+   using layers_type = std::vector<uint32_t>;
    using role_to_layer_map = std::vector<std::pair<std::string, int>>;
-   using addsurf_layer_map = std::map<unsigned, unsigned>;
+   using addsurf_layer_map = std::map<int, int>;
 
    // XXX: we also will need a layer_id to layer map, perhaps
    // make this the primary map, and the surface_id->layer a
@@ -100,7 +100,7 @@ struct layer_map {
       return this->layers.size();
    }
 
-   void add_surface(unsigned surface_id, unsigned layer_id) {
+   void add_surface(int surface_id, int layer_id) {
       this->surfaces[surface_id] = layer_id;
    }