Update C bindings to curvature and set properites additions (#451)

Add C bindings to `Manifold::ReserveIDs`, `Manifold::SetProperties`, and `Manifold::CalculateCurvature`.

bindings/c/include/manifoldc.h

@@ -2,6 +2,8 @@
 #include <stdint.h>
 #include <types.h>
 
+#include <cstdint>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -138,6 +140,12 @@ int manifold_genus(ManifoldManifold *m);
 ManifoldProperties manifold_get_properties(ManifoldManifold *m);
 int manifold_get_circular_segments(float radius);
 int manifold_original_id(ManifoldManifold *m);
+uint32_t manifold_reserve_ids(uint32_t n);
+ManifoldManifold *manifold_set_properties(
+    void *mem, ManifoldManifold *m, int num_prop,
+    void (*fun)(float *new_prop, ManifoldVec3 position, const float *old_prop));
+ManifoldManifold *manifold_calculate_curvature(void *mem, ManifoldManifold *m,
+                                               int gaussian_idx, int mean_idx);
 
 // CrossSection Shapes/Constructors
 

bindings/c/manifoldc.cpp

@@ -449,6 +449,27 @@ ManifoldBox *manifold_bounding_box(void *mem, ManifoldManifold *m) {
 
 float manifold_precision(ManifoldManifold *m) { return from_c(m)->Precision(); }
 
+uint32_t manifold_reserve_ids(uint32_t n) { return Manifold::ReserveIDs(n); }
+
+ManifoldManifold *manifold_set_properties(void *mem, ManifoldManifold *m,
+                                          int num_prop,
+                                          void (*fun)(float *new_prop,
+                                                      ManifoldVec3 position,
+                                                      const float *old_prop)) {
+  std::function<void(float *, glm::vec3, const float *)> f =
+      [fun](float *new_prop, glm::vec3 v, const float *old_prop) {
+        fun(new_prop, to_c(v), old_prop);
+      };
+  auto man = from_c(m)->SetProperties(num_prop, f);
+  return to_c(new (mem) Manifold(man));
+};
+
+ManifoldManifold *manifold_calculate_curvature(void *mem, ManifoldManifold *m,
+                                               int gaussian_idx, int mean_idx) {
+  auto man = from_c(m)->CalculateCurvature(gaussian_idx, mean_idx);
+  return to_c(new (mem) Manifold(man));
+}
+
 // Static Quality Globals
 
 void manifold_set_min_circular_angle(float degrees) {