Source sweep: Use cmStrCat for string concatenation

This patch is generated by a python script that uses regular expressions to
search for string concatenation patterns of the kind

```
std::string str = <ARG0>;
str += <ARG1>;
str += <ARG2>;
...
```

and replaces them with a single `cmStrCat` call

```
std::string str = cmStrCat(<ARG0>, <ARG1>, <ARG2>, ...);
```

If any `<ARGX>` is itself a concatenated string of the kind

```
a + b + c + ...;
```

then `<ARGX>` is split into multiple arguments for the `cmStrCat` call.

If there's a sequence of literals in the `<ARGX>`, then all literals in the
sequence are concatenated and merged into a single literal argument for
the `cmStrCat` call.

Single character strings are converted to single char arguments for
the `cmStrCat` call.

`std::to_string(...)` wrappings are removed from `cmStrCat` arguments,
because it supports numeric types as well as string types.

`arg.substr(x)` arguments to `cmStrCat` are replaced with
`cm::string_view(arg).substr(x)`

1 files changed, 3 insertions, 4 deletions

diff --git a/Source/cmQTWrapCPPCommand.cxx b/Source/cmQTWrapCPPCommand.cxx
index f5852a90a9..ba8281323b 100644
--- a/Source/cmQTWrapCPPCommand.cxx
+++ b/Source/cmQTWrapCPPCommand.cxx
@@ -6,6 +6,7 @@
 #include "cmMakefile.h"
 #include "cmRange.h"
 #include "cmSourceFile.h"
+#include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 
 #include <utility>
@@ -37,10 +38,8 @@ bool cmQTWrapCPPCommand::InitialPass(std::vector<std::string> const& args,
       // Compute the name of the file to generate.
       std::string srcName =
         cmSystemTools::GetFilenameWithoutLastExtension(arg);
-      std::string newName = this->Makefile->GetCurrentBinaryDirectory();
-      newName += "/moc_";
-      newName += srcName;
-      newName += ".cxx";
+      std::string newName = cmStrCat(
+        this->Makefile->GetCurrentBinaryDirectory(), "/moc_", srcName, ".cxx");
       cmSourceFile* sf = this->Makefile->GetOrCreateSource(newName, true);
       if (curr) {
         sf->SetProperty("ABSTRACT", curr->GetProperty("ABSTRACT"));