Introduce Vectors::concatenate()

2 files changed, 14 insertions, 5 deletions

diff --git a/toolsrc/include/vcpkg/base/util.h b/toolsrc/include/vcpkg/base/util.h
index 3834580b6..4f06a8231 100644
--- a/toolsrc/include/vcpkg/base/util.h
+++ b/toolsrc/include/vcpkg/base/util.h
@@ -7,6 +7,18 @@
 
 namespace vcpkg::Util
 {
+    template<class Container>
+    using ElementT = std::remove_reference_t<decltype(*begin(std::declval<Container>()))>;
+
+    namespace Vectors
+    {
+        template<class Container, class T = ElementT<Container>>
+        void concatenate(std::vector<T>* augend, const Container& addend)
+        {
+            augend->insert(augend->end(), addend.begin(), addend.end());
+        }
+    }
+
     template<class Cont, class Func>
     using FmapOut = decltype(std::declval<Func>()(*begin(std::declval<Cont>())));
 
@@ -71,9 +83,6 @@ namespace vcpkg::Util
         return std::find_if(begin(cont), end(cont), pred);
     }
 
-    template<class Container>
-    using ElementT = std::remove_reference_t<decltype(*begin(std::declval<Container>()))>;
-
     template<class Container, class T = ElementT<Container>>
     std::vector<T*> element_pointers(Container&& cont)
     {
@@ -153,4 +162,4 @@ namespace vcpkg::Util
         std::unique_lock<std::mutex> m_lock;
         T& m_ptr;
     };
-}
\ No newline at end of file
+}
diff --git a/toolsrc/src/vcpkg/install.cpp b/toolsrc/src/vcpkg/install.cpp
index 26f729a57..4a1e5537b 100644
--- a/toolsrc/src/vcpkg/install.cpp
+++ b/toolsrc/src/vcpkg/install.cpp
@@ -145,7 +145,7 @@ namespace vcpkg::Install
                 continue;
             }
 
-            output.insert(output.end(), t.files.begin(), t.files.end());
+            Util::Vectors::concatenate(&output, t.files);
         }
 
         std::sort(output.begin(), output.end());