cmTarget: Use std::unique_ptr instead of custom smart pointer

To manage the lifetime of `cmTargetInternals`, the private implementation of
`cmTarget`, use `std::unique_ptr<cmTargetInternals>` instead of
`cmTargetInternalPointer`, which is removed.

`cmTarget` is made non-copyable but movable.

2 files changed, 18 insertions, 52 deletions

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index a92bb9b..38bff1b 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -215,6 +215,7 @@ public:
 
 cmTarget::cmTarget(std::string const& name, cmStateEnums::TargetType type,
                    Visibility vis, cmMakefile* mf)
+  : impl(cm::make_unique<cmTargetInternals>())
 {
   assert(mf);
   impl->TargetType = type;
@@ -500,6 +501,11 @@ cmTarget::cmTarget(std::string const& name, cmStateEnums::TargetType type,
   }
 }
 
+cmTarget::cmTarget(cmTarget&&) noexcept = default;
+cmTarget::~cmTarget() = default;
+
+cmTarget& cmTarget::operator=(cmTarget&&) noexcept = default;
+
 cmStateEnums::TargetType cmTarget::GetType() const
 {
   return impl->TargetType;
@@ -1967,37 +1973,3 @@ bool cmTarget::GetMappedConfig(std::string const& desired_config,
 
   return true;
 }
-
-cmTargetInternalPointer::cmTargetInternalPointer()
-{
-  this->Pointer = new cmTargetInternals;
-}
-
-cmTargetInternalPointer::cmTargetInternalPointer(
-  cmTargetInternalPointer const& r)
-{
-  // Ideally cmTarget instances should never be copied.  However until
-  // we can make a sweep to remove that, this copy constructor avoids
-  // allowing the resources (Internals) to be copied.
-  this->Pointer = new cmTargetInternals(*r.Pointer);
-}
-
-cmTargetInternalPointer::~cmTargetInternalPointer()
-{
-  delete this->Pointer;
-}
-
-cmTargetInternalPointer& cmTargetInternalPointer::operator=(
-  cmTargetInternalPointer const& r)
-{
-  if (this == &r) {
-    return *this;
-  } // avoid warning on HP about self check
-  // Ideally cmTarget instances should never be copied.  However until
-  // we can make a sweep to remove that, this copy constructor avoids
-  // allowing the resources (Internals) to be copied.
-  cmTargetInternals* oldPointer = this->Pointer;
-  this->Pointer = new cmTargetInternals(*r.Pointer);
-  delete oldPointer;
-  return *this;
-}
diff --git a/Source/cmTarget.h b/Source/cmTarget.h
index f6ccdb4..5d90ba7 100644
--- a/Source/cmTarget.h
+++ b/Source/cmTarget.h
@@ -6,6 +6,7 @@
 #include "cmConfigure.h" // IWYU pragma: keep
 
 #include <iosfwd>
+#include <memory> // IWYU pragma: keep
 #include <set>
 #include <string>
 #include <unordered_map>
@@ -26,20 +27,6 @@ class cmPropertyMap;
 class cmSourceFile;
 class cmTargetInternals;
 
-class cmTargetInternalPointer
-{
-public:
-  cmTargetInternalPointer();
-  cmTargetInternalPointer(cmTargetInternalPointer const& r);
-  ~cmTargetInternalPointer();
-  cmTargetInternalPointer& operator=(cmTargetInternalPointer const& r);
-  cmTargetInternals* operator->() const { return this->Pointer; }
-  cmTargetInternals* Get() const { return this->Pointer; }
-
-private:
-  cmTargetInternals* Pointer;
-};
-
 /** \class cmTarget
  * \brief Represent a library or executable target loaded from a makefile.
  *
@@ -55,9 +42,6 @@ public:
     VisibilityImportedGlobally
   };
 
-  cmTarget(std::string const& name, cmStateEnums::TargetType type,
-           Visibility vis, cmMakefile* mf);
-
   enum CustomCommandType
   {
     PRE_BUILD,
@@ -65,6 +49,16 @@ public:
     POST_BUILD
   };
 
+  cmTarget(std::string const& name, cmStateEnums::TargetType type,
+           Visibility vis, cmMakefile* mf);
+
+  cmTarget(cmTarget const&) = delete;
+  cmTarget(cmTarget&&) noexcept;
+  ~cmTarget();
+
+  cmTarget& operator=(cmTarget const&) = delete;
+  cmTarget& operator=(cmTarget&&) noexcept;
+
   ///! Return the type of target.
   cmStateEnums::TargetType GetType() const;
 
@@ -263,7 +257,7 @@ private:
     cmStateEnums::ArtifactType artifact) const;
 
 private:
-  cmTargetInternalPointer impl;
+  std::unique_ptr<cmTargetInternals> impl;
 };
 
 typedef std::unordered_map<std::string, cmTarget> cmTargets;