1 files changed, 3 insertions, 3 deletions
diff --git a/Source/cmAddSubDirectoryCommand.cxx b/Source/cmAddSubDirectoryCommand.cxx
index 75bd6fb..75e5aa4 100644
--- a/Source/cmAddSubDirectoryCommand.cxx
+++ b/Source/cmAddSubDirectoryCommand.cxx
@@ -20,7 +20,7 @@ bool cmAddSubDirectoryCommand::InitialPass(
   }
 
   // store the binpath
-  std::string const& srcArg = args[0];
+  std::string const& srcArg = args.front();
   std::string binArg;
 
   bool excludeFromAll = false;
@@ -84,10 +84,10 @@ bool cmAddSubDirectoryCommand::InitialPass(
     const std::string& bin = this->Makefile->GetCurrentBinaryDirectory();
     size_t srcLen = src.length();
     size_t binLen = bin.length();
-    if (srcLen > 0 && src[srcLen - 1] == '/') {
+    if (srcLen > 0 && src.back() == '/') {
       --srcLen;
     }
-    if (binLen > 0 && bin[binLen - 1] == '/') {
+    if (binLen > 0 && bin.back() == '/') {
       --binLen;
     }
     binPath = bin.substr(0, binLen) + srcPath.substr(srcLen);