From fdc1f54935e6131e8e019860b6c58baab32bebd5 Mon Sep 17 00:00:00 2001
From: Matt Kuruc <mkuruc@nvidia.com>
Date: Tue, 5 Sep 2023 21:10:10 -0700
Subject: [PATCH] Replace `boost::variant` with `std::variant` in
 `pxr/base/trace`

---
 pxr/base/trace/eventData.cpp | 22 +++++++++++-----------
 pxr/base/trace/eventData.h   |  4 ++--
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/pxr/base/trace/eventData.cpp b/pxr/base/trace/eventData.cpp
index 6977a89f5e..f92b916f78 100644
--- a/pxr/base/trace/eventData.cpp
+++ b/pxr/base/trace/eventData.cpp
@@ -31,8 +31,8 @@ PXR_NAMESPACE_OPEN_SCOPE
 
 namespace {
 
-// Boost variant visitor to convert TraceEventData to JsValue
-class JsValue_visitor : public boost::static_visitor<void>
+// Variant visitor to convert TraceEventData to JsValue
+class JsValue_visitor
 {
 public:
     JsValue_visitor(JsWriter& writer)
@@ -67,8 +67,8 @@ class JsValue_visitor : public boost::static_visitor<void>
     JsWriter& _writer;
 };
 
-// Boost variant visitor to convert TraceEventData to TraceEvent::DataType
-class Type_visitor : public boost::static_visitor<TraceEvent::DataType>
+// Variant visitor to convert TraceEventData to TraceEvent::DataType
+class Type_visitor
 {
 public:
     TraceEvent::DataType operator()(int64_t i) const {
@@ -101,42 +101,42 @@ class Type_visitor : public boost::static_visitor<TraceEvent::DataType>
 
 TraceEvent::DataType TraceEventData::GetType() const
 {
-    return boost::apply_visitor(Type_visitor(), _data);
+    return std::visit(Type_visitor(), _data);
 }
 
 const int64_t* TraceEventData::GetInt() const
 {
     return GetType() == TraceEvent::DataType::Int ?
-        &boost::get<int64_t>(_data) : nullptr;
+        &std::get<int64_t>(_data) : nullptr;
 }
 
 const uint64_t* TraceEventData::GetUInt() const
 {
     return GetType() == TraceEvent::DataType::UInt ?
-        &boost::get<uint64_t>(_data) : nullptr;
+        &std::get<uint64_t>(_data) : nullptr;
 }
 
 const double* TraceEventData::GetFloat() const
 {
     return GetType() == TraceEvent::DataType::Float ?
-        &boost::get<double>(_data) : nullptr;
+        &std::get<double>(_data) : nullptr;
 }
 
 const bool* TraceEventData::GetBool() const
 {
     return GetType() == TraceEvent::DataType::Boolean ?
-        &boost::get<bool>(_data) : nullptr;
+        &std::get<bool>(_data) : nullptr;
 }
 
 const std::string* TraceEventData::GetString() const
 {
     return GetType() == TraceEvent::DataType::String ?
-        &boost::get<std::string>(_data) : nullptr;
+        &std::get<std::string>(_data) : nullptr;
 }
 
 void TraceEventData::WriteJson(JsWriter& writer) const
 {
-    boost::apply_visitor(JsValue_visitor(writer), _data);
+    std::visit(JsValue_visitor(writer), _data);
 }
 
 PXR_NAMESPACE_CLOSE_SCOPE
\ No newline at end of file
diff --git a/pxr/base/trace/eventData.h b/pxr/base/trace/eventData.h
index 3abddfe9b2..82a69b2e3a 100644
--- a/pxr/base/trace/eventData.h
+++ b/pxr/base/trace/eventData.h
@@ -30,8 +30,8 @@
 #include "pxr/base/trace/api.h"
 #include "pxr/base/trace/event.h"
 
-#include <boost/variant.hpp>
 #include <string>
+#include <variant>
 
 PXR_NAMESPACE_OPEN_SCOPE
 
@@ -88,7 +88,7 @@ class TraceEventData {
     struct _NoData {};
 
     using Variant = 
-        boost::variant<_NoData, std::string, bool, int64_t, uint64_t, double>;
+        std::variant<_NoData, std::string, bool, int64_t, uint64_t, double>;
     Variant _data;
 };