Made wrap_string() a little simpler to use.

dlib/string/string.h

@@ -496,8 +496,8 @@ namespace dlib
         >
     const std::basic_string<charT,traits,alloc> wrap_string (
         const std::basic_string<charT,traits,alloc>& str,
-        const unsigned long first_pad,
-        const unsigned long rest_pad,
+        const unsigned long first_pad = 0,
+        const unsigned long rest_pad = 0,
         const unsigned long max_per_line = 79
     )
     {
@@ -583,8 +583,8 @@ namespace dlib
         >
     const std::basic_string<charT> wrap_string (
         const charT* str,
-        const unsigned long first_pad,
-        const unsigned long rest_pad,
+        const unsigned long first_pad = 0,
+        const unsigned long rest_pad = 0,
         const unsigned long max_per_line = 79
     ) { return wrap_string(std::basic_string<charT>(str),first_pad,rest_pad,max_per_line); }
 

dlib/string/string_abstract.h

@@ -152,8 +152,8 @@ namespace dlib
         >
     const std::basic_string<charT,traits,alloc> wrap_string (
         const std::basic_string<charT,traits,alloc>& str,
-        const unsigned long first_pad,
-        const unsigned long rest_pad,
+        const unsigned long first_pad = 0,
+        const unsigned long rest_pad = 0,
         const unsigned long max_per_line = 79
     );
     /*!