app: preallocate layouts storage

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

diff --git a/src/app.cpp b/src/app.cpp
index 3f62575..e04b89b 100644 (file)
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -65,6 +65,7 @@ struct result<layouts_type> load_layout(char const *filename) {
    i >> jlayouts;
 
    auto layouts = layouts_type();
+   layouts.reserve(jlayouts.size());
    std::transform(std::cbegin(jlayouts), std::cend(jlayouts),
                   std::back_inserter(layouts), layout_from_json);