Fix ambiguous LogInput::operator<<(size_t) on macOS

src/util/logging/LogInput.cpp

@@ -110,6 +110,13 @@ LogInput& LogInput::operator<<(double f) {
   return *this;
 }
 
+#ifdef __APPLE__
+LogInput& LogInput::operator<<(size_t i) {
+  buf.append(std::to_string(i));
+  return *this;
+}
+#endif
+
 LogInput& LogInput::operator<<(const void *ptr) {
   std::stringbuf hbuf;
   std::ostream os(&hbuf);

src/util/logging/LogInput.hpp

@@ -47,6 +47,9 @@ public:
   LogInput& operator<<(int64_t);
   LogInput& operator<<(float);
   LogInput& operator<<(double);
+#ifdef __APPLE__
+  LogInput& operator<<(size_t);
+#endif
   LogInput& operator<<(const void*);
 
   LogInput& operator<<(const glm::vec2&);