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, 1 insertions, 5 deletions

diff --git a/src/Fl_Message.h b/src/Fl_Message.h
index 2f33df1d1..4b0581a8c 100644
--- a/src/Fl_Message.h
+++ b/src/Fl_Message.h
@@ -88,10 +88,6 @@ private:
   // and fl_password() return their input text, we *need* to store
   // the text in an internal (static) buffer. :-(
 
-  // The newer functions fl_input_str() and fl_password_str() return the
-  // text in an Fl_String object that must be allocated and free()'d by
-  // the caller.
-
   static char *input_buffer_; // points to the allocated text buffer
   static int input_size_;     // size of allocated text buffer
 
@@ -169,7 +165,7 @@ public:
 
   int innards(const char *fmt, va_list ap, const char *b0, const char *b1, const char *b2);
 
-  const char *input_innards(const char *fmt, va_list ap, const char *defstr, uchar type, int maxchar = -1);
+  const char *input_innards(const char *fmt, va_list ap, const char *defstr, uchar type, int maxchar = -1, bool str = false);
 };
 
 /**