Add boost/thread/detail/string_trim.hpp

Author: pdimov

include/boost/thread/detail/string_trim.hpp

@@ -0,0 +1,29 @@
+#ifndef BOOST_THREAD_DETAIL_STRING_TRIM_HPP_INCLUDED
+#define BOOST_THREAD_DETAIL_STRING_TRIM_HPP_INCLUDED
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <string>
+
+namespace boost
+{
+namespace thread_detail
+{
+
+inline std::string string_trim( std::string const& s )
+{
+    std::size_t i = s.find_first_not_of( " \t\r\n" );
+
+    if( i == std::string::npos ) return std::string();
+
+    std::size_t j = s.find_last_not_of( " \t\r\n" );
+
+    return s.substr( i, j + 1 - i );
+}
+
+} // namespace thread_detail
+} // namespace boost
+
+#endif // #ifndef BOOST_THREAD_DETAIL_STRING_TRIM_HPP_INCLUDED

test/Jamfile.v2

@@ -1099,4 +1099,9 @@ rule generate_self_contained_header_tests
     ;
 
     test-suite test_self_contained_headers : [ generate_self_contained_header_tests ] ;
+
+    test-suite detail
+    :
+          [ run detail/string_trim_test.cpp ]
+    ;
 }

test/detail/string_trim_test.cpp

@@ -0,0 +1,48 @@
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/thread/detail/string_trim.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int main()
+{
+    using boost::thread_detail::string_trim;
+
+    BOOST_TEST_EQ( string_trim( "" ), std::string( "" ) );
+    BOOST_TEST_EQ( string_trim( " " ), std::string( "" ) );
+    BOOST_TEST_EQ( string_trim( "  " ), std::string( "" ) );
+    BOOST_TEST_EQ( string_trim( "   " ), std::string( "" ) );
+
+    BOOST_TEST_EQ( string_trim( " \t\r\n \t\r\n" ), std::string( "" ) );
+
+    BOOST_TEST_EQ( string_trim( "a" ), std::string( "a" ) );
+
+    BOOST_TEST_EQ( string_trim( " a" ), std::string( "a" ) );
+    BOOST_TEST_EQ( string_trim( "  a" ), std::string( "a" ) );
+    BOOST_TEST_EQ( string_trim( "   a" ), std::string( "a" ) );
+
+    BOOST_TEST_EQ( string_trim( "a " ), std::string( "a" ) );
+    BOOST_TEST_EQ( string_trim( "a  " ), std::string( "a" ) );
+    BOOST_TEST_EQ( string_trim( "a   " ), std::string( "a" ) );
+
+    BOOST_TEST_EQ( string_trim( " a " ), std::string( "a" ) );
+    BOOST_TEST_EQ( string_trim( "  a  " ), std::string( "a" ) );
+    BOOST_TEST_EQ( string_trim( "   a   " ), std::string( "a" ) );
+
+    BOOST_TEST_EQ( string_trim( "a b" ), std::string( "a b" ) );
+
+    BOOST_TEST_EQ( string_trim( " a b" ), std::string( "a b" ) );
+    BOOST_TEST_EQ( string_trim( "  a b" ), std::string( "a b" ) );
+    BOOST_TEST_EQ( string_trim( "   a b" ), std::string( "a b" ) );
+
+    BOOST_TEST_EQ( string_trim( "a b " ), std::string( "a b" ) );
+    BOOST_TEST_EQ( string_trim( "a b  " ), std::string( "a b" ) );
+    BOOST_TEST_EQ( string_trim( "a b   " ), std::string( "a b" ) );
+
+    BOOST_TEST_EQ( string_trim( " a b " ), std::string( "a b" ) );
+    BOOST_TEST_EQ( string_trim( "  a  b  " ), std::string( "a  b" ) );
+    BOOST_TEST_EQ( string_trim( "   a   b   " ), std::string( "a   b" ) );
+
+    return boost::report_errors();
+}