[string] add to_camel_case

dune/xt/common/string.cc

@@ -13,6 +13,7 @@
 #include <algorithm>
 #include <cctype>
 #include <string>
+#include <sstream>
 
 #include "string.hh"
 
@@ -37,6 +38,19 @@ std::string to_upper(const std::string& ss)
 }
 
 
+std::string to_camel_case(const std::string& ss)
+{
+  std::stringstream out;
+  for (auto&& word : tokenize(ss, "_", boost::algorithm::token_compress_on)) {
+    if (word.size() > 0) {
+      out << to_upper(word.substr(0, 1));
+      out << word.substr(1);
+    }
+  }
+  return out.str();
+}
+
+
 } // namespace Common
 } // namespace XT
 } // namespace Dune

dune/xt/common/string.hh

@@ -128,6 +128,12 @@ std::string to_lower(const std::string& ss);
 std::string to_upper(const std::string& ss);
 
 
+/**
+ * \brief Converts this_sample_string to ThisSampleString.
+ */
+std::string to_camel_case(const std::string& ss);
+
+
 /**
   \brief Returns a string of lengths t' whitespace (or whitespace chars).
   \param[in]  t          defines the length of the return string (after conversion to string)