Merge branch 'et_world_coordinates' into fs_emboss

src/libslic3r/libslic3r.h

@@ -24,6 +24,13 @@
 #include <type_traits>
 #include <optional>
 
+#ifdef _WIN32
+// On MSVC, std::deque degenerates to a list of pointers, which defeats its purpose of reducing allocator load and memory fragmentation.
+// https://github.com/microsoft/STL/issues/147#issuecomment-1090148740
+// Thus it is recommended to use boost::container::deque instead.
+#include <boost/container/deque.hpp>
+#endif // _WIN32
+
 #include "Technologies.hpp"
 #include "Semver.hpp"
 
@@ -74,6 +81,16 @@ namespace Slic3r {
 
 extern Semver SEMVER;
 
+// On MSVC, std::deque degenerates to a list of pointers, which defeats its purpose of reducing allocator load and memory fragmentation.
+template<class T, class Allocator = std::allocator<T>>
+using deque = 
+#ifdef _WIN32
+    // Use boost implementation, which allocates blocks of 512 bytes instead of blocks of 8 bytes.
+    boost::container::deque<T, Allocator>;
+#else // _WIN32
+    std::deque<T, Allocator>;
+#endif // _WIN32
+
 template<typename T, typename Q>
 inline T unscale(Q v) { return T(v) * T(SCALING_FACTOR); }