Add is_blank classifier

glywk · glywk · commit 1d9706feb796 · 2023-01-21T00:42:52.000+01:00
diff --git a/include/boost/algorithm/string/classification.hpp b/include/boost/algorithm/string/classification.hpp
@@ -85,6 +85,22 @@ namespace boost {
             return detail::is_classifiedF(std::ctype_base::alpha, Loc);
         }
 
+#ifndef BOOST_NO_CXX11
+        //! is_blank predicate
+        /*!
+            Construct the \c is_classified predicate for the \c ctype_base::blank category.
+
+            \param Loc A locale used for classification
+            \return An instance of the \c is_classified predicate
+            \since c++11
+        */
+        inline detail::is_classifiedF
+        is_blank(const std::locale& Loc=std::locale())
+        {
+            return detail::is_classifiedF(std::ctype_base::blank, Loc);
+        }
+#endif
+    
         //! is_cntrl predicate
         /*!
             Construct the \c is_classified predicate for the \c ctype_base::cntrl category.   
@@ -294,6 +310,9 @@ namespace boost {
     // pull names to the boost namespace
     using algorithm::is_classified;
     using algorithm::is_space;
+#ifndef BOOST_NO_CXX11
+    using algorithm::is_blank;
+#endif
     using algorithm::is_alnum;
     using algorithm::is_alpha;
     using algorithm::is_cntrl;
diff --git a/string/doc/quickref.xml b/string/doc/quickref.xml
@@ -667,6 +667,13 @@
                             <functionname>is_space()</functionname>
                         </entry>
                     </row>
+                    <row>
+                        <entry>is_blank</entry>
+                        <entry>Recognize blanks</entry>
+                        <entry>
+                            <functionname>is_blank()</functionname>
+                        </entry>
+                    </row>
                     <row>
                         <entry>is_alnum</entry>
                         <entry>Recognize alphanumeric characters</entry>
diff --git a/string/test/predicate_test.cpp b/string/test/predicate_test.cpp
@@ -138,7 +138,11 @@ void classification_test()
     TEST_CLASS( is_any_of( string("abc") ), "aaabbcc", "aaxb" );
     TEST_CLASS( is_any_of( "abc" ), "aaabbcc", "aaxb" );
     TEST_CLASS( is_from_range( 'a', 'c' ), "aaabbcc", "aaxb" );
-
+    
+#ifndef BOOST_NO_CXX11
+    TEST_CLASS( is_blank(), " \t", "\t \n\r" );
+#endif
+    
     TEST_CLASS( !is_classified(std::ctype_base::space), "...", "..\n\r\t " );
     TEST_CLASS( ( !is_any_of("abc") && is_from_range('a','e') ) || is_space(), "d e", "abcde" );
 
