diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3879c84..a5f29de 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -26,6 +26,7 @@ set(header_files
   Tokens.h              
   TranslationUnit.h
   Diagnostic.h
+  Utility.h
   )
 set(cc_files
   CodeCompleteResults.cc
@@ -41,6 +42,7 @@ set(cc_files
   Tokens.cc             
   TranslationUnit.cc
   Diagnostic.cc
+  Utility.cc
   )
 
 add_library(${project_name} SHARED ${header_files} ${cc_files})
diff --git a/src/CodeCompleteResults.cc b/src/CodeCompleteResults.cc
index da916f8..e6aea17 100644
--- a/src/CodeCompleteResults.cc
+++ b/src/CodeCompleteResults.cc
@@ -3,11 +3,9 @@
 #include <exception>
 
 clang::CodeCompleteResults::
-CodeCompleteResults(CXTranslationUnit &cx_tu,
-                    const std::string &file_name,
+CodeCompleteResults(CXTranslationUnit &cx_tu, const std::string &file_name,
                     const std::map<std::string, std::string>  &buffers,
-                    int line_num,
-                    int column) {
+                    unsigned line_num, unsigned column) {
   std::vector<CXUnsavedFile> files;
   for (auto &buffer : buffers) {
     CXUnsavedFile file;
@@ -31,15 +29,15 @@ clang::CodeCompleteResults::~CodeCompleteResults() {
   delete cx_results;
 }
 
-int clang::CodeCompleteResults::
+unsigned clang::CodeCompleteResults::
 size() {
   return cx_results->NumResults;
 }
 
 clang::CompletionString clang::CodeCompleteResults::
-get(int i) {
+get(unsigned i) {
   if (i >= size()) {
-    throw std::invalid_argument("clang::CodeCompleteResults::get(int i): i>=size()");
+    throw std::invalid_argument("clang::CodeCompleteResults::get(unsigned i): i>=size()");
   }
   return CompletionString(cx_results->Results[i].CompletionString);
 }
diff --git a/src/CodeCompleteResults.h b/src/CodeCompleteResults.h
index dda4d89..e6c8a17 100644
--- a/src/CodeCompleteResults.h
+++ b/src/CodeCompleteResults.h
@@ -6,15 +6,14 @@
 
 namespace clang {
   class CodeCompleteResults {
-  public:
-    CodeCompleteResults(CXTranslationUnit &cx_tu,
-                        const std::string &file_name,
+    friend class TranslationUnit;
+    CodeCompleteResults(CXTranslationUnit &cx_tu, const std::string &file_name,
                         const std::map<std::string, std::string>  &buffers,
-                        int line_num,
-                        int column);
+                        unsigned line_num, unsigned column);
+  public:
     ~CodeCompleteResults();
-    CompletionString get(int index);
-    int size();
+    CompletionString get(unsigned index);
+    unsigned size();
 
     CXCodeCompleteResults *cx_results;
   };
diff --git a/src/CompileCommand.cc b/src/CompileCommand.cc
index 3d98579..5c4ec93 100644
--- a/src/CompileCommand.cc
+++ b/src/CompileCommand.cc
@@ -1,12 +1,13 @@
 #include "CompileCommand.h"
 #include "CompileCommands.h"
+#include "Utility.h"
 
 std::string clang::CompileCommand::
 get_command() {
   std::string res;
   unsigned N = clang_CompileCommand_getNumArgs(cx_command);
-  for (int i = 0; i < N; i++) {
-    res += clang_getCString(clang_CompileCommand_getArg(cx_command, i));
+  for (unsigned i = 0; i < N; i++) {
+    res += clang::to_string(clang_CompileCommand_getArg(cx_command, i));
   }
   return res;
 }
@@ -15,8 +16,8 @@ std::vector<std::string> clang::CompileCommand::
 get_command_as_args() {
   unsigned N = clang_CompileCommand_getNumArgs(cx_command);
   std::vector<std::string> res(N);
-  for (int i = 0; i < N; i++) {
-    res[i] = clang_getCString(clang_CompileCommand_getArg(cx_command, i));
+  for (unsigned i = 0; i < N; i++) {
+    res[i] = clang::to_string(clang_CompileCommand_getArg(cx_command, i));
   }
   return res;
 }
diff --git a/src/CompletionString.cc b/src/CompletionString.cc
index 1c0cb88..9833466 100644
--- a/src/CompletionString.cc
+++ b/src/CompletionString.cc
@@ -1,34 +1,27 @@
 #include "CompletionString.h"
+#include "Utility.h"
 
 clang::CompletionString::
-CompletionString(const CXCompletionString &cx_str) : cx_str(cx_str) {}
+CompletionString(const CXCompletionString &cx_completion_sting) : cx_completion_sting(cx_completion_sting) {}
 
 bool clang::CompletionString::available() {
-  return clang_getCompletionAvailability(cx_str) == CXAvailability_Available;
+  return clang_getCompletionAvailability(cx_completion_sting) == CXAvailability_Available;
 }
 
-int clang::CompletionString::get_num_chunks() {
-    return clang_getNumCompletionChunks(cx_str);
+unsigned clang::CompletionString::get_num_chunks() {
+    return clang_getNumCompletionChunks(cx_completion_sting);
 }
 
 std::vector<clang::CompletionChunk> clang::CompletionString::get_chunks() {
   std::vector<clang::CompletionChunk> res;
-  for (size_t i = 0; i < get_num_chunks(); i++) {
-    auto cxstr=clang_getCompletionChunkText(cx_str, i);
-    res.emplace_back(clang_getCString(cxstr), static_cast<CompletionChunkKind> (clang_getCompletionChunkKind(cx_str, i)));
-    clang_disposeString(cxstr);
+  for (unsigned i = 0; i < get_num_chunks(); i++) {
+    res.emplace_back(clang::to_string(clang_getCompletionChunkText(cx_completion_sting, i)), static_cast<CompletionChunkKind> (clang_getCompletionChunkKind(cx_completion_sting, i)));
   }
   return res;
 }
 
 std::string clang::CompletionString::get_brief_comments() {
-  std::string brief_comments;
-  auto cxstr=clang_getCompletionBriefComment(cx_str);
-  if(cxstr.data!=NULL) {
-    brief_comments=clang_getCString(cxstr);
-    clang_disposeString(cxstr);
-  }
-  return brief_comments;
+  return clang::to_string(clang_getCompletionBriefComment(cx_completion_sting));
 }
 
 clang::CompletionChunk::
diff --git a/src/CompletionString.h b/src/CompletionString.h
index 43d953b..8c3b16c 100644
--- a/src/CompletionString.h
+++ b/src/CompletionString.h
@@ -28,13 +28,13 @@ namespace clang {
 
   class CompletionString {
   public:
-    explicit CompletionString(const CXCompletionString &cx_str);
+    explicit CompletionString(const CXCompletionString &cx_completion_sting);
     bool available();
     std::vector<CompletionChunk> get_chunks();
     std::string get_brief_comments();
-    int get_num_chunks();
+    unsigned get_num_chunks();
     
-    CXCompletionString cx_str;
+    CXCompletionString cx_completion_sting;
   };
 }  // namespace clang
 #endif  // COMPLETIONSTRING_H_
diff --git a/src/Cursor.cc b/src/Cursor.cc
index 4a7c992..6cd3271 100644
--- a/src/Cursor.cc
+++ b/src/Cursor.cc
@@ -1,4 +1,5 @@
 #include "Cursor.h"
+#include "Utility.h"
 
 const clang::CursorKind clang::Cursor::get_kind() {
   return (CursorKind) clang_getCursorKind(this->cx_cursor);
@@ -13,19 +14,15 @@ clang::SourceRange clang::Cursor::get_source_range() const {
 }
 
 std::string clang::Cursor::get_usr() const {
-  auto cxstr=clang_getCursorUSR(cx_cursor);
-  std::string USR=clang_getCString(cxstr);
-  clang_disposeString(cxstr);
-  return USR;
+  return clang::to_string(clang_getCursorUSR(cx_cursor));
 }
 
-std::string clang::Cursor::get_referenced_usr() const {
-  auto referenced=clang_getCursorReferenced(cx_cursor);
-  if(!clang_Cursor_isNull(referenced)) {
-    return Cursor(referenced).get_usr();
-  }
-  else
-    return "";
+clang::Cursor clang::Cursor::get_referenced() const {
+  return Cursor(clang_getCursorReferenced(cx_cursor));
+}
+
+clang::Cursor::operator bool() const {
+  return !clang_Cursor_isNull(cx_cursor);
 }
 
 bool clang::Cursor::operator==(const Cursor& rhs) const {
diff --git a/src/Cursor.h b/src/Cursor.h
index ae85534..7c01ca7 100644
--- a/src/Cursor.h
+++ b/src/Cursor.h
@@ -181,7 +181,8 @@ namespace clang {
     SourceLocation get_source_location() const;
     SourceRange get_source_range() const;
     std::string get_usr() const;
-    std::string get_referenced_usr() const;
+    Cursor get_referenced() const;
+    operator bool() const;
     bool operator==(const Cursor& rhs) const;
     CXCursor cx_cursor;
   };
diff --git a/src/Diagnostic.cc b/src/Diagnostic.cc
index f2f4f52..177dabb 100644
--- a/src/Diagnostic.cc
+++ b/src/Diagnostic.cc
@@ -1,21 +1,19 @@
 #include "Diagnostic.h"
 #include "SourceLocation.h"
 #include "Tokens.h"
+#include "Utility.h"
 
 clang::Diagnostic::Diagnostic(CXTranslationUnit& cx_tu, CXDiagnostic& cx_diagnostic) {
   severity=clang_getDiagnosticSeverity(cx_diagnostic);
   severity_spelling=get_severity_spelling(severity);
-  auto cxstr=clang_getDiagnosticSpelling(cx_diagnostic);
-  spelling=clang_getCString(cxstr);
-  clang_disposeString(cxstr);
-  clang::SourceLocation location(clang_getDiagnosticLocation(cx_diagnostic));
+  spelling=clang::to_string(clang_getDiagnosticSpelling(cx_diagnostic));
+  clang::SourceLocation start_location(clang_getDiagnosticLocation(cx_diagnostic));
   
-  clang::SourceRange range(location, location);
-  clang::Tokens tokens(cx_tu, range);
+  path=start_location.get_path();
+  unsigned start_offset=start_location.get_offset();
+  clang::Tokens tokens(cx_tu, SourceRange(start_location, start_location));
   if(tokens.size()==1) {
-    auto& token=tokens[0];
-    auto locations=token.source_range.get_source_locations();
-    this->range=SourceRange::get_range_data(location, locations.second);
+    offsets=std::pair<unsigned, unsigned>(start_offset, tokens.begin()->offsets.second);
   }
 }
 
diff --git a/src/Diagnostic.h b/src/Diagnostic.h
index a01e776..42d3785 100644
--- a/src/Diagnostic.h
+++ b/src/Diagnostic.h
@@ -7,15 +7,16 @@
 
 namespace clang {
   class Diagnostic {
-  public:
+    friend class TranslationUnit;
     Diagnostic(CXTranslationUnit& cx_tu, CXDiagnostic& cx_diagnostic);
-    
+  public:
     static const std::string get_severity_spelling(unsigned severity);
 
     unsigned severity;
     std::string severity_spelling;
     std::string spelling;
-    RangeData range;
+    std::string path;
+    std::pair<unsigned, unsigned> offsets;
   };
 }
 
diff --git a/src/SourceLocation.cc b/src/SourceLocation.cc
index 976eb01..8227938 100644
--- a/src/SourceLocation.cc
+++ b/src/SourceLocation.cc
@@ -1,41 +1,34 @@
 #include "SourceLocation.h"
+#include "Utility.h"
 
 // // // // // // // //
 //  SourceLocation   //
 // // // // // // // //
-clang::SourceLocation::
-SourceLocation(CXTranslationUnit &tu,
-               const std::string &filename,
-               int line_number,
-               int line_offset) {
-  CXFile file = clang_getFile(tu,
-                              filename.c_str());
-  cx_location = clang_getLocation(tu,
-                                file,
-                                line_number,
-                                line_offset);
+clang::SourceLocation::SourceLocation(CXTranslationUnit &tu, const std::string &filepath, unsigned offset) {
+  CXFile file = clang_getFile(tu, filepath.c_str());
+  cx_location = clang_getLocationForOffset(tu, file, offset);
 }
 
-clang::SourceLocation::
-SourceLocation(CXTranslationUnit &tu,
-               const std::string &filepath,
-               int offset) {
-  CXFile file = clang_getFile(tu,
-                              filepath.c_str());
-  cx_location = clang_getLocationForOffset(tu,
-                                         file,
-                                         offset);
+std::string clang::SourceLocation::get_path() {
+  std::string path;
+  get_data(&path, NULL, NULL, NULL);
+  return path;
+}
+unsigned clang::SourceLocation::get_offset() {
+  unsigned offset;
+  get_data(NULL, NULL, NULL, &offset);
+  return offset;
 }
 
-void clang::SourceLocation::
-get_location_info(std::string* path,
-                  unsigned *line,
-                  unsigned *column,
-                  unsigned *offset) {
-   CXFile file;
-   clang_getExpansionLocation(cx_location, &file, line, column, offset);
-   if (path != NULL && file!=NULL) {
-     path->operator=(((clang_getCString((clang_getFileName(file))))));
-   }
+void clang::SourceLocation::get_data(std::string* path, unsigned *line, unsigned *column, unsigned *offset) {
+  if(path==nullptr)
+    clang_getExpansionLocation(cx_location, NULL, line, column, offset);
+  else {
+    CXFile file;
+    clang_getExpansionLocation(cx_location, &file, line, column, offset);
+    if (file!=NULL) {
+      *path=clang::to_string(clang_getFileName(file));
+    }
+  }
 }
 
diff --git a/src/SourceLocation.h b/src/SourceLocation.h
index 0837dc1..9f29b99 100644
--- a/src/SourceLocation.h
+++ b/src/SourceLocation.h
@@ -6,24 +6,19 @@
 namespace clang {
   
   class SourceLocation {
+    friend class TranslationUnit;
+    SourceLocation(CXTranslationUnit &tu, const std::string &filepath, unsigned offset);
   public:
     SourceLocation(const CXSourceLocation& cx_location) : cx_location(cx_location) {}
-    
-    SourceLocation(CXTranslationUnit &cx_tu,
-                   const std::string &filename,
-                   int line_number,
-                   int column);
-
-    SourceLocation(CXTranslationUnit &tu,
-                   const std::string &filepath,
-                   int offset);
 
-    void get_location_info(std::string *path,
-                           unsigned *line,
-                           unsigned *column,
-                           unsigned *offset);
+  public:
+    std::string get_path();
+    unsigned get_offset();
 
     CXSourceLocation cx_location;
+    
+  private:
+    void get_data(std::string *path, unsigned *line, unsigned *column, unsigned *offset);
   };
 
 }  // namespace clang
diff --git a/src/SourceRange.cc b/src/SourceRange.cc
index ae3bd24..5c97323 100644
--- a/src/SourceRange.cc
+++ b/src/SourceRange.cc
@@ -5,23 +5,10 @@ SourceRange(clang::SourceLocation &start, clang::SourceLocation &end) {
   cx_range = clang_getRange(start.cx_location, end.cx_location);
 }
 
-std::pair<clang::SourceLocation, clang::SourceLocation> clang::SourceRange::get_source_locations() {
-  return std::pair<SourceLocation, SourceLocation>(clang_getRangeStart(cx_range), clang_getRangeEnd(cx_range));
-}
-
-clang::RangeData clang::SourceRange::get_range_data(clang::SourceLocation &start, clang::SourceLocation &end) {
-  std::string path;
-  unsigned start_offset, end_offset;
-  start.get_location_info(&path, NULL, NULL, &start_offset);
-  end.get_location_info(NULL, NULL, NULL, &end_offset);
-  RangeData range_data;
-  range_data.path=path;
-  range_data.start_offset=start_offset;
-  range_data.end_offset=end_offset;
-  return range_data;
-}
-
-clang::RangeData clang::SourceRange::get_range_data() {
-  auto locations=get_source_locations();
-  return get_range_data(locations.first, locations.second);
+std::pair<unsigned, unsigned> clang::SourceRange::get_offsets() {
+  SourceLocation start(clang_getRangeStart(cx_range)), end(clang_getRangeEnd(cx_range));
+  std::pair<unsigned, unsigned> offsets;
+  offsets.first=start.get_offset();
+  offsets.second=end.get_offset();
+  return offsets;
 }
\ No newline at end of file
diff --git a/src/SourceRange.h b/src/SourceRange.h
index 7a85504..c39eb18 100644
--- a/src/SourceRange.h
+++ b/src/SourceRange.h
@@ -3,21 +3,14 @@
 #include <clang-c/Index.h>
 #include "SourceLocation.h"
 #include <string>
+#include <utility>
 
 namespace clang {  
-  class RangeData {
-  public:
-    std::string path;
-    unsigned start_offset, end_offset;
-  };
-  
   class SourceRange {
   public:
     SourceRange(const CXSourceRange& cx_range) : cx_range(cx_range) {}
     SourceRange(SourceLocation &start, SourceLocation &end);
-    std::pair<SourceLocation, SourceLocation> get_source_locations();
-    static RangeData get_range_data(SourceLocation &start, SourceLocation &end);
-    RangeData get_range_data();
+    std::pair<unsigned, unsigned> get_offsets();
     CXSourceRange cx_range;
   };
 }  // namespace clang
diff --git a/src/Token.cc b/src/Token.cc
index 30f2c54..e3a9b9c 100644
--- a/src/Token.cc
+++ b/src/Token.cc
@@ -1,4 +1,5 @@
 #include "Token.h"
+#include "Utility.h"
 
 // // // // //
 //  Token   //
@@ -15,12 +16,11 @@ clang::SourceRange clang::Token::get_source_range() {
   return SourceRange(clang_getTokenExtent(cx_tu, cx_token));
 }
 // returns a string description of this tokens kind
-std::string clang::Token::get_token_spelling() {
-  CXString s = clang_getTokenSpelling(cx_tu, cx_token);
-  return std::string(clang_getCString(s));
+std::string clang::Token::get_spelling() {
+  return clang::to_string(clang_getTokenSpelling(cx_tu, cx_token));
 }
 
-const clang::TokenKind clang::Token::kind() {
+const clang::TokenKind clang::Token::get_kind() {
   return (TokenKind) clang_getTokenKind(cx_token);
 }
 
@@ -30,9 +30,7 @@ bool clang::Token::has_type() {
   if(clang_Cursor_isNull(referenced))
     return false;
   auto type=clang_getCursorType(referenced);
-  auto cxstr=clang_getTypeSpelling(type);
-  std::string spelling=clang_getCString(cxstr);
-  clang_disposeString(cxstr);
+  auto spelling=clang::to_string(clang_getTypeSpelling(type));
   return spelling!="";
 }
 
@@ -41,17 +39,13 @@ std::string clang::Token::get_type() {
   auto referenced=clang_getCursorReferenced(cx_cursor);
   if(!clang_Cursor_isNull(referenced)) {
     auto type=clang_getCursorType(referenced);
-    auto cxstr=clang_getTypeSpelling(type);
-    spelling=clang_getCString(cxstr);
-    clang_disposeString(cxstr);
+    spelling=clang::to_string(clang_getTypeSpelling(type));
     std::string auto_end="";
     //TODO fix const auto
     if((spelling.size()>=4 && spelling.substr(0, 4)=="auto")) {
       auto_end=spelling.substr(4);
       auto type=clang_getCanonicalType(clang_getCursorType(cx_cursor));
-      auto cxstr=clang_getTypeSpelling(type);
-      spelling=clang_getCString(cxstr);
-      clang_disposeString(cxstr);
+      spelling=clang::to_string(clang_getTypeSpelling(type));
       if(spelling.find(" ")==std::string::npos)
         spelling+=auto_end;
     }
@@ -61,54 +55,9 @@ std::string clang::Token::get_type() {
 
 std::string clang::Token::get_brief_comments() {
   std::string comment_string;
-  auto referenced=clang_getCursorReferenced(cx_cursor);
-  auto comment=clang_Cursor_getParsedComment(referenced);
-  if(clang_Comment_getKind(comment)==CXComment_FullComment) {
-    size_t para_c=0;
-    for(unsigned c=0;c<clang_Comment_getNumChildren(comment);c++) {
-      auto child_comment=clang_Comment_getChild(comment, c);
-      if(clang_Comment_getKind(child_comment)==CXComment_Paragraph) {
-        para_c++;
-        if(para_c>=2)
-          break;
-        for(unsigned c=0;c<clang_Comment_getNumChildren(child_comment);c++) {
-          auto grandchild_comment=clang_Comment_getChild(child_comment, c);
-          if(clang_Comment_getKind(grandchild_comment)==CXComment_Text) {
-            auto cxstr=clang_TextComment_getText(grandchild_comment);
-            comment_string+=clang_getCString(cxstr);
-            comment_string+="\n";
-            clang_disposeString(cxstr);
-            size_t dot_position=comment_string.find(".");
-            if(dot_position!=std::string::npos)
-              return comment_string.substr(0, dot_position);
-          }
-          if(clang_Comment_getKind(grandchild_comment)==CXComment_InlineCommand) {
-            auto cxstr=clang_InlineCommandComment_getCommandName(grandchild_comment);
-            if(comment_string.size()>0)
-              comment_string.pop_back();
-            if(clang_InlineCommandComment_getNumArgs(grandchild_comment)==0)
-              comment_string+=clang_getCString(cxstr);
-            clang_disposeString(cxstr);
-            for(unsigned arg_c=0;arg_c<clang_InlineCommandComment_getNumArgs(grandchild_comment);arg_c++) {
-              auto cxstr=clang_InlineCommandComment_getArgText(grandchild_comment, arg_c);
-              if(cxstr.data!=NULL) {
-                if(arg_c>0)
-                  comment_string+=" ";
-                comment_string+=clang_getCString(cxstr);
-                clang_disposeString(cxstr);
-              }
-            }
-          }
-        }
-      }
-      /*cout << "  " << clang_Comment_getKind(child_comment) << ", children: " << clang_Comment_getNumChildren(child_comment) << endl;
-      auto cxstr=clang_FullComment_getAsHTML(child_comment);
-      cout << "  " << clang_getCString(cxstr) << endl;
-      clang_disposeString(cxstr);*/
-    }
-    while(comment_string.size()>0 && (comment_string.back()=='\n' || comment_string.back()==' '))
-      comment_string.pop_back();
+  auto referenced=get_cursor().get_referenced();
+  if(referenced) {
+    comment_string=clang::to_string(clang_Cursor_getBriefCommentText(referenced.cx_cursor));
   }
-  
   return comment_string;
 }
diff --git a/src/Token.h b/src/Token.h
index d88817f..15ded6c 100644
--- a/src/Token.h
+++ b/src/Token.h
@@ -16,12 +16,14 @@ namespace clang {
   };
 
   class Token {
-  public:
+    friend class Tokens;
     Token(CXTranslationUnit &cx_tu, CXToken &cx_token, CXCursor &cx_cursor): 
-      cx_tu(cx_tu), cx_token(cx_token), cx_cursor(cx_cursor), source_range(get_source_range()) {};
-    const TokenKind kind();
-    std::string get_token_spelling();
+      cx_tu(cx_tu), cx_token(cx_token), cx_cursor(cx_cursor), offsets(get_source_range().get_offsets()) {};
+  public:
+    const TokenKind get_kind();
+    std::string get_spelling();
     SourceLocation get_source_location();
+    SourceRange get_source_range();
     clang::Cursor get_cursor() {return clang::Cursor(cx_cursor);}
     bool has_type();
     std::string get_type();
@@ -29,9 +31,7 @@ namespace clang {
     CXTranslationUnit &cx_tu;
     CXToken& cx_token;
     CXCursor& cx_cursor;
-    SourceRange source_range;
-  private:
-    SourceRange get_source_range();
+    std::pair<unsigned, unsigned> offsets;
   };
 }  // namespace clang
 #endif  // TOKEN_H_
diff --git a/src/Tokens.cc b/src/Tokens.cc
index 390948c..f2fd316 100644
--- a/src/Tokens.cc
+++ b/src/Tokens.cc
@@ -1,15 +1,15 @@
 #include "Tokens.h"
+#include "Utility.h"
 #include <iostream>
 using namespace std;
 
-clang::Tokens::Tokens(CXTranslationUnit &cx_tu, SourceRange &range): cx_tu(cx_tu) {
-  
+clang::Tokens::Tokens(CXTranslationUnit &cx_tu, const SourceRange &range): cx_tu(cx_tu) {
   clang_tokenize(cx_tu, range.cx_range, &cx_tokens, &num_tokens);
   cx_cursors.clear();
-  cx_cursors.reserve(num_tokens);
+  cx_cursors.resize(num_tokens);
   clang_annotateTokens(cx_tu, cx_tokens, num_tokens, cx_cursors.data());
-  for (int i = 0; i < num_tokens; i++) {
-    emplace_back(cx_tu, cx_tokens[i], cx_cursors[i]);
+  for (unsigned i = 0; i < num_tokens; i++) {
+    emplace_back(Token(cx_tu, cx_tokens[i], cx_cursors[i]));
   }
 }
 
@@ -20,16 +20,50 @@ clang::Tokens::~Tokens() {
 //This works across TranslationUnits! However, to get rename refactoring to work, 
 //one have to open all the files that might include a similar token
 //Similar tokens defined as tokens with equal referenced cursors. 
-std::vector<std::pair<unsigned, unsigned> > clang::Tokens::get_similar_token_offsets(clang::Token& token) {
+std::vector<std::pair<unsigned, unsigned> > clang::Tokens::get_similar_token_offsets(const std::string &usr) {
   std::vector<std::pair<unsigned, unsigned> > offsets;
-  auto referenced_usr=token.get_cursor().get_referenced_usr();
-  if(referenced_usr!="") {
-    for(auto &a_token: *this) {
-      if(referenced_usr==a_token.get_cursor().get_referenced_usr() && token.get_token_spelling()==a_token.get_token_spelling()) {
-        auto range_data=a_token.source_range.get_range_data();
-        offsets.emplace_back(range_data.start_offset, range_data.end_offset);
+  for(auto &token: *this) {
+    if(token.get_kind()==clang::Token_Identifier) {
+      auto referenced=token.get_cursor().get_referenced();
+      if(referenced && usr==referenced.get_usr()) {
+        offsets.emplace_back(token.offsets);
       }
     }
   }
   return offsets;
 }
+
+std::vector<std::pair<std::string, unsigned> > clang::Tokens::get_cxx_methods() {
+  std::vector<std::pair<std::string, unsigned> > methods;
+  long last_offset=-1;
+  for(auto &token: *this) {
+    if(token.get_kind()==clang::Token_Identifier) {
+      auto cursor=token.get_cursor();
+      auto kind=cursor.get_kind();
+      if(kind==clang::CursorKind::CXXMethod || kind==clang::CursorKind::Constructor || kind==clang::CursorKind::Destructor) {
+        auto offset=cursor.get_source_location().get_offset();
+        if(offset!=last_offset) {
+          std::string method;
+          if(kind==clang::CursorKind::CXXMethod) {
+            auto type=clang_getResultType(clang_getCursorType(cursor.cx_cursor));
+            method+=clang::to_string(clang_getTypeSpelling(type));
+            auto pos=method.find(" ");
+            if(pos!=std::string::npos)
+              method.erase(pos, 1);
+            method+=" ";
+          }
+          
+          clang::Cursor parent(clang_getCursorSemanticParent(cursor.cx_cursor));
+          method+=clang::to_string(clang_getCursorDisplayName(parent.cx_cursor));
+          
+          method+="::";
+          
+          method+=clang::to_string(clang_getCursorDisplayName(cursor.cx_cursor));
+          methods.emplace_back(method, offset);
+        }
+        last_offset=offset;
+      }
+    }
+  }
+  return methods;
+}
diff --git a/src/Tokens.h b/src/Tokens.h
index 81693d1..7f1ea1b 100644
--- a/src/Tokens.h
+++ b/src/Tokens.h
@@ -8,10 +8,13 @@
 
 namespace clang {
   class Tokens : public std::vector<clang::Token> {
+    friend class TranslationUnit;
+    friend class Diagnostic;
+    Tokens(CXTranslationUnit &cx_tu, const SourceRange &range);
   public:
-    Tokens(CXTranslationUnit &cx_tu, SourceRange &range);
     ~Tokens();
-    std::vector<std::pair<unsigned, unsigned> > get_similar_token_offsets(clang::Token& token);
+    std::vector<std::pair<unsigned, unsigned> > get_similar_token_offsets(const std::string &usr);
+    std::vector<std::pair<std::string, unsigned> > get_cxx_methods();
   private:
     CXToken *cx_tokens;
     unsigned num_tokens;
diff --git a/src/TranslationUnit.cc b/src/TranslationUnit.cc
index 37f8104..1118f37 100644
--- a/src/TranslationUnit.cc
+++ b/src/TranslationUnit.cc
@@ -1,6 +1,7 @@
 #include "TranslationUnit.h"
 #include "SourceLocation.h"
 #include "Tokens.h"
+#include "Utility.h"
 #include <fstream>
 #include <sstream>
 
@@ -90,10 +91,8 @@ unsigned clang::TranslationUnit::DefaultFlags() {
   return CXTranslationUnit_CacheCompletionResults | CXTranslationUnit_PrecompiledPreamble | CXTranslationUnit_Incomplete | CXTranslationUnit_IncludeBriefCommentsInCodeCompletion;
 }
 
-clang::CodeCompleteResults clang::TranslationUnit::get_code_completions(const std::map<std::string, std::string> &buffers, int line_number, int column) {
-  auto cxstr=clang_getTranslationUnitSpelling(cx_tu);
-  std::string path=clang_getCString(cxstr);
-  clang_disposeString(cxstr);
+clang::CodeCompleteResults clang::TranslationUnit::get_code_completions(const std::map<std::string, std::string> &buffers, unsigned line_number, unsigned column) {
+  auto path=clang::to_string(clang_getTranslationUnitSpelling(cx_tu));
 
   clang::CodeCompleteResults results(cx_tu, path, buffers, line_number, column);
   return results;
@@ -110,9 +109,7 @@ std::vector<clang::Diagnostic> clang::TranslationUnit::get_diagnostics() {
 }
 
 std::unique_ptr<clang::Tokens> clang::TranslationUnit::get_tokens(unsigned start_offset, unsigned end_offset) {
-  auto cxstr=clang_getTranslationUnitSpelling(cx_tu);
-  std::string path=clang_getCString(cxstr);
-  clang_disposeString(cxstr);
+  auto path=clang::to_string(clang_getTranslationUnitSpelling(cx_tu));
   clang::SourceLocation start_location(cx_tu, path, start_offset);
   clang::SourceLocation end_location(cx_tu, path, end_offset);
   clang::SourceRange range(start_location, end_location);
diff --git a/src/TranslationUnit.h b/src/TranslationUnit.h
index 8bf2563..e10d465 100644
--- a/src/TranslationUnit.h
+++ b/src/TranslationUnit.h
@@ -35,7 +35,7 @@ namespace clang {
                const std::map<std::string, std::string> &buffers,
                unsigned flags=DefaultFlags());
                
-   clang::CodeCompleteResults get_code_completions(const std::map<std::string, std::string> &buffers, int line_number, int column);
+   clang::CodeCompleteResults get_code_completions(const std::map<std::string, std::string> &buffers, unsigned line_number, unsigned column);
    std::vector<clang::Diagnostic> get_diagnostics();
    std::unique_ptr<Tokens> get_tokens(unsigned start_offset, unsigned end_offset);
    clang::Cursor get_cursor(std::string path, unsigned offset);
diff --git a/src/Utility.cc b/src/Utility.cc
new file mode 100644
index 0000000..7f1c266
--- /dev/null
+++ b/src/Utility.cc
@@ -0,0 +1,10 @@
+#include "Utility.h"
+
+std::string clang::to_string(CXString cx_string) {
+  std::string string;
+  if(cx_string.data!=NULL) {
+    string=clang_getCString(cx_string);
+    clang_disposeString(cx_string);
+  }
+  return string;
+}
\ No newline at end of file
diff --git a/src/Utility.h b/src/Utility.h
new file mode 100644
index 0000000..6f7e319
--- /dev/null
+++ b/src/Utility.h
@@ -0,0 +1,10 @@
+#ifndef UTILITY_H_
+#define UTILITY_H_
+#include <clang-c/Index.h>
+#include <string>
+
+namespace clang {
+  std::string to_string(CXString cx_string);
+}
+
+#endif  // UTILITY_H_
\ No newline at end of file
diff --git a/src/clangmm.h b/src/clangmm.h
index 3ffe3ae..b1abb81 100644
--- a/src/clangmm.h
+++ b/src/clangmm.h
@@ -13,4 +13,5 @@
 #include "Index.h"
 #include "Cursor.h"
 #include "Diagnostic.h"
+#include "Utility.h"
 #endif  // CLANGMM_H_
diff --git a/tests/CodeCompleteResults_H_Test.cc b/tests/CodeCompleteResults_H_Test.cc
index d2e880f..bb75e07 100644
--- a/tests/CodeCompleteResults_H_Test.cc
+++ b/tests/CodeCompleteResults_H_Test.cc
@@ -31,7 +31,7 @@ BOOST_AUTO_TEST_CASE(code_complete_results) {
   auto results=tu.get_code_completions(buffers, 4, 5);
 
   bool substr_found=false;
-  for(int c=0;c<results.size();c++) {
+  for(unsigned c=0;c<results.size();c++) {
     if(results.get(c).get_chunks()[1].chunk=="substr") {
       substr_found=true;
       break;
diff --git a/tests/Diagnostics_Test.cc b/tests/Diagnostics_Test.cc
index 70972eb..c56b6a6 100644
--- a/tests/Diagnostics_Test.cc
+++ b/tests/Diagnostics_Test.cc
@@ -23,6 +23,5 @@ BOOST_AUTO_TEST_CASE(diagnostics_test) {
   auto diagnostics=tu.get_diagnostics();
   BOOST_CHECK(diagnostics.size()==1);
   BOOST_CHECK(diagnostics[0].spelling=="use of undeclared identifier 'undeclared_variable'");
-  BOOST_CHECK(diagnostics[0].range.path=="./case/main_error.cpp");
   BOOST_CHECK(diagnostics[0].severity==3);
 }
diff --git a/tests/SourceLocation_H_Test.cc b/tests/SourceLocation_H_Test.cc
index ab6d1c0..6722b4a 100644
--- a/tests/SourceLocation_H_Test.cc
+++ b/tests/SourceLocation_H_Test.cc
@@ -10,30 +10,8 @@ BOOST_AUTO_TEST_CASE(source_location) {
   clang::TranslationUnit tu(index, path);
   auto tokens=tu.get_tokens(0, 113);
 
-  clang::SourceRange token_range  = (*tokens)[28].source_range;
+  auto offsets=(*tokens)[28].offsets;
 
-  unsigned token_start_line, token_start_column, token_start_offset,
-    token_end_line, token_end_column, token_end_offset;
-  std::string token_start_path, token_end_path;
-
-  auto locations=token_range.get_source_locations();
-
-  locations.first.get_location_info(&token_start_path,
-                                    &token_start_line,
-                                    &token_start_column,
-                                    &token_start_offset);
-
-  locations.second.get_location_info(&token_end_path,
-                                     &token_end_line,
-                                     &token_end_column,
-                                     &token_end_offset);
-
-  BOOST_CHECK(token_start_path == path);
-  BOOST_CHECK(token_start_line == 6);
-  BOOST_CHECK(token_start_column == 3);
-  BOOST_CHECK(token_start_offset == 103);
-  BOOST_CHECK(token_end_path == path);
-  BOOST_CHECK(token_end_line == 6);
-  BOOST_CHECK(token_end_column == 9);
-  BOOST_CHECK(token_end_offset == 109);
+  BOOST_CHECK(offsets.first == 103);
+  BOOST_CHECK(offsets.second == 109);
 }
diff --git a/tests/Token_H_Test.cc b/tests/Token_H_Test.cc
index 38198c2..6325062 100644
--- a/tests/Token_H_Test.cc
+++ b/tests/Token_H_Test.cc
@@ -12,8 +12,8 @@ BOOST_AUTO_TEST_CASE(token) {
   auto tokens=tu.get_tokens(0, 113);
 
   BOOST_CHECK(tokens->size() == 32);
-  BOOST_CHECK((*tokens)[1].kind() == clang::TokenKind::Token_Identifier);
+  BOOST_CHECK((*tokens)[1].get_kind() == clang::TokenKind::Token_Identifier);
 
-  std::string str = (*tokens)[28].get_token_spelling();
+  std::string str = (*tokens)[28].get_spelling();
   BOOST_CHECK(str == "return");  
 }