Make Fl_String and Fl_Int_Vector private (#789)

- add CMake option 'OPTION_USE_STD'
- add configure option '--enable-use_std'
- move FL/Fl_String.H to src/Fl_String.H
- move FL/Fl_Int_Vector.H to src/Fl_Int_Vector.H
- remove Fl_String from demo program examples/callbacks.cxx
- remove Fl_Int_Vector from public header FL/Fl_Table.H
- some methods of Fl_Table are no longer inline
- add CMake option OPTION_USE_STD to allow std::string in some
  selected functions and methods

Experimental, may be removed before release:

- use either Fl_Int_Vector or std::vector in Fl_Table depending
  on CMake OPTION_USE_STD or configure --enable-use_std

Move all fl_filename* functions that use Fl_String to fluid

Main changes in fluid:
 - add fluid_filename.h and .cxx
 - include "fluid_filename.h" rather than <FL/filename.H>

Update fl_input(), fl_password() and test/ask

- add maxchar parameter to fl_input() and fl_password()
- fl_input_str() and fl_password_str() are optional and return
  std::string if enabled (FLTK_USE_STD)

1 files changed, 10 insertions, 1 deletions

diff --git a/FL/Fl_Preferences.H b/FL/Fl_Preferences.H
index adf976706..98cc42523 100644
--- a/FL/Fl_Preferences.H
+++ b/FL/Fl_Preferences.H
@@ -25,6 +25,9 @@
 #  include "fl_attr.h"
 
 //class Fl_String;
+#if (FLTK_USE_STD)
+#include <string>
+#endif
 
 /**
  \brief Fl_Preferences store user settings between application starts.
@@ -241,7 +244,6 @@ public:
   char set( const char *entry, double value, int precision );
   char set( const char *entry, const char *value );
   char set( const char *entry, const void *value, int size );
-//  char set( const char *entry, const Fl_String &value );
 
   char get( const char *entry, int &value, int defaultValue );
   char get( const char *entry, float &value,  float defaultValue );
@@ -251,8 +253,15 @@ public:
   char get( const char *entry, void *&value,  const void *defaultValue, int defaultSize );
   char get( const char *entry, void *value,   const void *defaultValue, int defaultSize, int maxSize );
   char get( const char *entry, void *value,   const void *defaultValue, int defaultSize, int *size );
+
+//  char set( const char *entry, const Fl_String &value );
 //  char get( const char *entry, Fl_String &value, const Fl_String &defaultValue );
 
+#if (FLTK_USE_STD)
+  char set( const char *entry, const std::string &value );
+  char get( const char *entry, std::string &value, const std::string &defaultValue );
+#endif
+
   int size( const char *entry );
 
   char get_userdata_path( char *path, int pathlen );