Clean up extraneous copies in Messages

This removes 109 allocations from running `tests/SelfTest`
(437057 -> 436948).

6 files changed, 11 insertions, 13 deletions

diff --git a/src/catch2/catch_message.cpp b/src/catch2/catch_message.cpp
index 4ab6ecf5..d4723e94 100644
--- a/src/catch2/catch_message.cpp
+++ b/src/catch2/catch_message.cpp
@@ -19,8 +19,8 @@ namespace Catch {
     ////////////////////////////////////////////////////////////////////////////
 
 
-    ScopedMessage::ScopedMessage( MessageBuilder const& builder ):
-        m_info( builder.m_info ) {
+    ScopedMessage::ScopedMessage( MessageBuilder&& builder ):
+        m_info( CATCH_MOVE(builder.m_info) ) {
         m_info.message = builder.m_stream.str();
         getResultCapture().pushScopedMessage( m_info );
     }
diff --git a/src/catch2/catch_message.hpp b/src/catch2/catch_message.hpp
index 4f71f227..33169ddf 100644
--- a/src/catch2/catch_message.hpp
+++ b/src/catch2/catch_message.hpp
@@ -39,11 +39,10 @@ namespace Catch {
                         ResultWas::OfType type ):
             m_info(macroName, lineInfo, type) {}
 
-
         template<typename T>
-        MessageBuilder& operator << ( T const& value ) {
+        MessageBuilder&& operator << ( T const& value ) && {
             m_stream << value;
-            return *this;
+            return CATCH_MOVE(*this);
         }
 
         MessageInfo m_info;
@@ -51,7 +50,7 @@ namespace Catch {
 
     class ScopedMessage {
     public:
-        explicit ScopedMessage( MessageBuilder const& builder );
+        explicit ScopedMessage( MessageBuilder&& builder );
         ScopedMessage( ScopedMessage& duplicate ) = delete;
         ScopedMessage( ScopedMessage&& old ) noexcept;
         ~ScopedMessage();
diff --git a/src/catch2/interfaces/catch_interfaces_capture.hpp b/src/catch2/interfaces/catch_interfaces_capture.hpp
index 4c820724..a6f83fa5 100644
--- a/src/catch2/interfaces/catch_interfaces_capture.hpp
+++ b/src/catch2/interfaces/catch_interfaces_capture.hpp
@@ -65,7 +65,7 @@ namespace Catch {
         virtual void pushScopedMessage( MessageInfo const& message ) = 0;
         virtual void popScopedMessage( MessageInfo const& message ) = 0;
 
-        virtual void emplaceUnscopedMessage( MessageBuilder const& builder ) = 0;
+        virtual void emplaceUnscopedMessage( MessageBuilder&& builder ) = 0;
 
         virtual void handleFatalErrorCondition( StringRef message ) = 0;
 
diff --git a/src/catch2/interfaces/catch_interfaces_reporter.cpp b/src/catch2/interfaces/catch_interfaces_reporter.cpp
index 8c8bac54..e9aff69c 100644
--- a/src/catch2/interfaces/catch_interfaces_reporter.cpp
+++ b/src/catch2/interfaces/catch_interfaces_reporter.cpp
@@ -60,10 +60,9 @@ namespace Catch {
             // Copy message into messages list.
             // !TBD This should have been done earlier, somewhere
             MessageBuilder builder( assertionResult.getTestMacroName(), assertionResult.getSourceInfo(), assertionResult.getResultType() );
-            builder << assertionResult.getMessage();
-            builder.m_info.message = builder.m_stream.str();
+            builder.m_info.message = static_cast<std::string>(assertionResult.getMessage());
 
-            infoMessages.push_back( builder.m_info );
+            infoMessages.push_back( CATCH_MOVE(builder.m_info) );
         }
     }
 
diff --git a/src/catch2/internal/catch_run_context.cpp b/src/catch2/internal/catch_run_context.cpp
index 76e41982..506dc5c9 100644
--- a/src/catch2/internal/catch_run_context.cpp
+++ b/src/catch2/internal/catch_run_context.cpp
@@ -402,8 +402,8 @@ namespace Catch {
         m_messages.erase(std::remove(m_messages.begin(), m_messages.end(), message), m_messages.end());
     }
 
-    void RunContext::emplaceUnscopedMessage( MessageBuilder const& builder ) {
-        m_messageScopes.emplace_back( builder );
+    void RunContext::emplaceUnscopedMessage( MessageBuilder&& builder ) {
+        m_messageScopes.emplace_back( CATCH_MOVE(builder) );
     }
 
     std::string RunContext::getCurrentTestName() const {
diff --git a/src/catch2/internal/catch_run_context.hpp b/src/catch2/internal/catch_run_context.hpp
index 87d637d8..2a6c6ae0 100644
--- a/src/catch2/internal/catch_run_context.hpp
+++ b/src/catch2/internal/catch_run_context.hpp
@@ -90,7 +90,7 @@ namespace Catch {
         void pushScopedMessage( MessageInfo const& message ) override;
         void popScopedMessage( MessageInfo const& message ) override;
 
-        void emplaceUnscopedMessage( MessageBuilder const& builder ) override;
+        void emplaceUnscopedMessage( MessageBuilder&& builder ) override;
 
         std::string getCurrentTestName() const override;