Fix compilation error on windows+msvc2013

- Some missing includes of <algorithms> in order to have
  stdd::min() and similar functions.
- Need to cast numIndices and numNVerts to int explicitly
  in order to solve warning treated as an error about
  precision loss.
- Can't do vector[0] for an empty vector, it'll generate
  a runtime range check error.
- MSVC only works fine with make_pair(foo, bar) syntax,
  without explicit template substitution here. Otherwise
  weird 'can't cast int to int&&' errors are happening.

examples/common/hud.h

@@ -25,6 +25,7 @@
 #ifndef HUD_H
 #define HUD_H
 
+#include <algorithm>
 #include <vector>
 #include <string>
 #include <cstdarg>

examples/simpleCpu/algebra.h

@@ -24,6 +24,7 @@
 
 #pragma once
 
+#include <algorithm>
 #include <limits>
 #include <cmath>
 #include <vector>

opensubdiv/osdutil/evaluator_capi.cpp

@@ -161,9 +161,9 @@ void openSubdiv_getEvaluatorTopology(
     // application to test this yet.
     *numVertices =  evaluation_descr->topology.numVertices;
     *refinementLevel =  evaluation_descr->topology.refinementLevel;
-    *numIndices =  evaluation_descr->topology.indices.size();
+    *numIndices =  (int)evaluation_descr->topology.indices.size();
     *indices =  &evaluation_descr->topology.indices[0];
-    *numNVerts =  evaluation_descr->topology.nverts.size();
+    *numNVerts =  (int)evaluation_descr->topology.nverts.size();
     *nverts =  &evaluation_descr->topology.nverts[0];
 }
 

opensubdiv/osdutil/mesh.cpp

@@ -292,9 +292,9 @@ bool _ProcessTagsAndFinishMesh(
 {
     mesh->SetInterpolateBoundaryMethod(OpenSubdiv::HbrMesh<T>::k_InterpolateBoundaryEdgeOnly);
 
-    const int* currentInt = &tagData.intArgs[0];
-    const float* currentFloat = &tagData.floatArgs[0];
-    const string* currentString = &tagData.stringArgs[0];
+    const int* currentInt = tagData.intArgs.size() ? &tagData.intArgs[0] : NULL;
+    const float* currentFloat = tagData.floatArgs.size() ? &tagData.floatArgs[0] : NULL;
+    const string* currentString = tagData.stringArgs.size() ? &tagData.stringArgs[0] : NULL;
 
     // TAGS (crease, corner, hole, smooth triangles, edits(vertex,
     // edge, face), creasemethod, facevaryingpropagatecorners, interpolateboundary

opensubdiv/osdutil/patchPartitioner.h

@@ -151,7 +151,7 @@ OsdUtilPatchPartitioner::OsdUtilPatchPartitioner(FarPatchTables const *srcPatchT
             int patchIndex = paIt->GetPatchIndex() + i;
             int ptexIndex = srcPatchParamTable[patchIndex].faceIndex;
             int partitionID = idsOnPtexFaces[ptexIndex];
-            sortProxy[i] = std::make_pair<int, int>(partitionID, patchIndex);
+            sortProxy[i] = std::make_pair(partitionID, patchIndex);
             ++numPatches[partitionID];
         }
         // sort by partitionID