Change std::nan("") to proper nan constants

src/libslic3r/AABBTreeIndirect.hpp

@@ -772,7 +772,7 @@ inline bool is_any_triangle_in_radius(
             { vertices, faces, tree, point };
 
     size_t hit_idx;
-	VectorType hit_point = VectorType::Ones() * (std::nan(""));
+    VectorType hit_point = VectorType::Ones() * (NaN<typename VectorType::Scalar>);
 
 	if(tree.empty())
 	{

src/libslic3r/Arrange.hpp

@@ -15,7 +15,7 @@ class CircleBed {
     double radius_;
 public:
 
-    inline CircleBed(): center_(0, 0), radius_(std::nan("")) {}
+    inline CircleBed(): center_(0, 0), radius_(NaNd) {}
     explicit inline CircleBed(const Point& c, double r): center_(c), radius_(r) {}
 
     inline double radius() const { return radius_; }

src/libslic3r/Optimize/Optimizer.hpp

@@ -41,13 +41,13 @@ template<size_t N> using Bounds = std::array<Bound, N>;
 class StopCriteria {
 
     // If the absolute value difference between two scores.
-    double m_abs_score_diff = std::nan("");
+    double m_abs_score_diff = NaNd;
 
     // If the relative value difference between two scores.
-    double m_rel_score_diff = std::nan("");
+    double m_rel_score_diff = NaNd;
 
     // Stop if this value or better is found.
-    double m_stop_score = std::nan("");
+    double m_stop_score = NaNd;
 
     // A predicate that if evaluates to true, the optimization should terminate
     // and the best result found prior to termination should be returned.

src/libslic3r/SLA/Rotfinder.cpp

@@ -76,7 +76,7 @@ struct Facestats {
 // Try to guess the number of support points needed to support a mesh
 double get_misalginment_score(const TriangleMesh &mesh, const Transform3f &tr)
 {
-    if (mesh.its.vertices.empty()) return std::nan("");
+    if (mesh.its.vertices.empty()) return NaNd;
 
     auto accessfn = [&mesh, &tr](size_t fi) {
         Facestats fc{get_transformed_triangle(mesh, tr, fi)};
@@ -117,7 +117,7 @@ inline double get_supportedness_score(const Facestats &fc)
 // Try to guess the number of support points needed to support a mesh
 double get_supportedness_score(const TriangleMesh &mesh, const Transform3f &tr)
 {
-    if (mesh.its.vertices.empty()) return std::nan("");
+    if (mesh.its.vertices.empty()) return NaNd;
 
     auto accessfn = [&mesh, &tr](size_t fi) {
         Facestats fc{get_transformed_triangle(mesh, tr, fi)};
@@ -149,10 +149,10 @@ float find_ground_level(const TriangleMesh &mesh,
     return execution::reduce(ex_tbb, size_t(0), vsize, zmin, minfn, accessfn, granularity);
 }
 
-float get_supportedness_onfloor_score(const TriangleMesh &mesh,
+double get_supportedness_onfloor_score(const TriangleMesh &mesh,
                                        const Transform3f  &tr)
 {
-    if (mesh.its.vertices.empty()) return std::nan("");
+    if (mesh.its.vertices.empty()) return NaNd;
 
     size_t Nthreads = std::thread::hardware_concurrency();
 

src/libslic3r/SLA/SupportTreeBuildsteps.cpp

@@ -654,7 +654,7 @@ void SupportTreeBuildsteps::filter()
     for (const SupportPoint &sp : m_support_pts) {
         m_thr();
         heads.emplace_back(
-            std::nan(""),
+            NaNd,
             sp.head_front_radius,
             0.,
             m_cfg.head_penetration_mm,

src/libslic3r/SLAPrintSteps.cpp

@@ -1036,7 +1036,7 @@ void SLAPrint::Steps::merge_slices_and_eval_stats() {
     // Estimated printing time
     // A layers count o the highest object
     if (printer_input.size() == 0)
-        print_statistics.estimated_print_time = std::nan("");
+        print_statistics.estimated_print_time = NaNd;
     else {
         print_statistics.estimated_print_time = estim_time;
         print_statistics.layers_times = layers_times;

src/libslic3r/libslic3r.h

@@ -331,6 +331,12 @@ public:
     inline bool   empty() const { return size() == 0; }
 };
 
+template<class T, class = FloatingOnly<T>>
+constexpr T NaN = std::numeric_limits<T>::quiet_NaN();
+
+constexpr float NaNf = NaN<float>;
+constexpr double NaNd = NaN<double>;
+
 } // namespace Slic3r
 
 #endif

src/slic3r/GUI/DoubleSlider.cpp

@@ -1163,7 +1163,7 @@ void Control::draw_ruler(wxDC& dc)
         }
     };
 
-    double short_tick = std::nan("");
+    double short_tick = NaNd;
     int tick = 0;
     double value = 0.0;
     size_t sequence = 0;

src/slic3r/GUI/GLCanvas3D.hpp

@@ -822,7 +822,7 @@ public:
     
     class WipeTowerInfo {
     protected:
-        Vec2d m_pos = {std::nan(""), std::nan("")};
+        Vec2d m_pos = {NaNd, NaNd};
         double m_rotation = 0.;
         BoundingBoxf m_bb;
         friend class GLCanvas3D;

tests/sla_print/sla_test_utils.cpp

@@ -386,7 +386,7 @@ long raster_pxsum(const sla::RasterGrayscaleAA &raster)
 
 double raster_white_area(const sla::RasterGrayscaleAA &raster)
 {
-    if (raster.resolution().pixels() == 0) return std::nan("");
+    if (raster.resolution().pixels() == 0) return NaNd;
     
     auto res = raster.resolution();
     double a = 0;