Merge pull request #2864 from nvmkuruc/sdfoptional

Replace `boost::optional` with `std::optional` in `SdfLayer` and `Sdf_TextParserContext`

(Internal change: 2308968)

pxr/usd/sdf/layer.cpp

@@ -307,7 +307,7 @@ SdfLayer::_WaitForInitializationAndCheckIfSuccessful()
     // The callers of this method are responsible for checking the result
     // and dropping any references they hold.  As a convenience to them,
     // we return the value here.
-    return _initializationWasSuccessful.get();
+    return _initializationWasSuccessful.value();
 }
 
 static bool
@@ -2954,7 +2954,7 @@ SdfLayer::_ShouldNotify() const
 {
     // Only notify if this layer has been successfully initialized.
     // (If initialization is not yet complete, do not notify.)
-    return _initializationWasSuccessful.get_value_or(false);
+    return _initializationWasSuccessful.value_or(false);
 }
 
 void

pxr/usd/sdf/layer.h

@@ -45,11 +45,10 @@
 #include "pxr/base/vt/value.h"
 #include "pxr/base/work/dispatcher.h"
 
-#include <boost/optional.hpp>
-
 #include <atomic>
 #include <functional>
 #include <memory>
+#include <optional>
 #include <set>
 #include <string>
 #include <vector>
@@ -1956,7 +1955,7 @@ class SdfLayer
 
     // This is an optional<bool> that is only set once initialization
     // is complete, before _initializationComplete is set.
-    boost::optional<bool> _initializationWasSuccessful;
+    std::optional<bool> _initializationWasSuccessful;
 
     // remembers the last 'IsDirty' state.
     mutable bool _lastDirtyState;

pxr/usd/sdf/textParserContext.h

@@ -39,8 +39,7 @@
 
 #include "pxr/base/tf/token.h"
 
-#include <boost/optional.hpp>
-
+#include <optional>
 #include <string>
 #include <vector>
 
@@ -85,7 +84,7 @@ class Sdf_TextParserContext {
     bool relParsingAllowTargetData;
     // relationship target paths that will be saved in a list op
     // (use a boost::optional to track whether we have seen an opinion at all.)
-    boost::optional<SdfPathVector> relParsingTargetPaths;
+    std::optional<SdfPathVector> relParsingTargetPaths;
     // relationship target paths that will be appended to the relationship's
     // list of target children.
     SdfPathVector relParsingNewTargetChildren;