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, 1 insertions, 3 deletions

diff --git a/Source/CTest/cmParseGTMCoverage.cxx b/Source/CTest/cmParseGTMCoverage.cxx
index 881bf2d..621ca79 100644
--- a/Source/CTest/cmParseGTMCoverage.cxx
+++ b/Source/CTest/cmParseGTMCoverage.cxx
@@ -31,9 +31,7 @@ bool cmParseGTMCoverage::LoadCoverageData(const char* d)
   for (i = 0; i < numf; i++) {
     std::string file = dir.GetFile(i);
     if (file != "." && file != ".." && !cmSystemTools::FileIsDirectory(file)) {
-      std::string path = d;
-      path += "/";
-      path += file;
+      std::string path = cmStrCat(d, '/', file);
       if (cmSystemTools::GetFilenameLastExtension(path) == ".mcov") {
         if (!this->ReadMCovFile(path.c_str())) {
           return false;