From db15c7419dcdf0886d350bd25f77dad72491bdad Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Sat, 9 Oct 2021 16:50:14 +0300
Subject: [PATCH] Add sv_eq_test

---
 include/boost/core/string_view.hpp |  7 +++
 test/Jamfile.v2                    |  1 +
 test/sv_eq_test.cpp                | 84 ++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+)
 create mode 100644 test/sv_eq_test.cpp

diff --git a/include/boost/core/string_view.hpp b/include/boost/core/string_view.hpp
index 8540f0c..23c2d50 100644
--- a/include/boost/core/string_view.hpp
+++ b/include/boost/core/string_view.hpp
@@ -26,6 +26,7 @@
 #include <cstddef>
 #include <cstring>
 #include <climits>
+#include <iosfwd>
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 # include <string_view>
 #endif
@@ -905,6 +906,12 @@ public:
     }
 };
 
+template<class Ch> std::basic_ostream<Ch>& operator<<( std::basic_ostream<Ch>& os, basic_string_view<Ch> str )
+{
+    os.write( str.data(), str.size() );
+    return os;
+}
+
 #if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
 template<class Ch> BOOST_CONSTEXPR_OR_CONST std::size_t basic_string_view<Ch>::npos;
 #endif
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index e9f901c..170b53f 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -264,6 +264,7 @@ run sv_find_last_of_test.cpp ;
 run sv_find_first_not_of_test.cpp ;
 run sv_find_last_not_of_test.cpp ;
 run sv_contains_test.cpp ;
+run sv_eq_test.cpp ;
 
 use-project /boost/core/swap : ./swap ;
 build-project ./swap ;
diff --git a/test/sv_eq_test.cpp b/test/sv_eq_test.cpp
new file mode 100644
index 0000000..a71e125
--- /dev/null
+++ b/test/sv_eq_test.cpp
@@ -0,0 +1,84 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/string_view.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <cstddef>
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+# include <string_view>
+#endif
+
+#define TEST_EQ(x, y) BOOST_TEST_EQ(x, y); BOOST_TEST_NOT((x) != (y))
+#define TEST_NE(x, y) BOOST_TEST_NE(x, y); BOOST_TEST_NOT((x) == (y))
+
+int main()
+{
+    std::size_t const npos = boost::core::string_view::npos;
+
+    {
+        boost::core::string_view sv1( "" );
+        boost::core::string_view sv2( "" );
+        boost::core::string_view sv3( "123" );
+        boost::core::string_view sv4( "123" );
+        boost::core::string_view sv5( "12345" );
+        boost::core::string_view sv6( "12345" );
+
+        TEST_EQ( sv1, sv1 );
+        TEST_EQ( sv1, sv2 );
+        TEST_NE( sv1, sv3 );
+        TEST_NE( sv1, sv5 );
+
+        TEST_EQ( sv3, sv3 );
+        TEST_EQ( sv3, sv4 );
+        TEST_NE( sv3, sv1 );
+        TEST_NE( sv3, sv5 );
+
+        TEST_EQ( sv5, sv5 );
+        TEST_EQ( sv5, sv6 );
+        TEST_NE( sv5, sv1 );
+        TEST_NE( sv5, sv3 );
+
+        BOOST_TEST_EQ( sv1, std::string( "" ) );
+        BOOST_TEST_EQ( std::string( "" ), sv1 );
+
+        BOOST_TEST_NE( sv1, std::string( "1" ) );
+        BOOST_TEST_NE( std::string( "1" ), sv1 );
+
+        BOOST_TEST_EQ( sv3, std::string( "123" ) );
+        BOOST_TEST_EQ( std::string( "123" ), sv3 );
+
+        BOOST_TEST_NE( sv3, std::string( "122" ) );
+        BOOST_TEST_NE( std::string( "122" ), sv3 );
+
+        BOOST_TEST_EQ( sv1, "" );
+        BOOST_TEST_EQ( "", sv1 );
+
+        BOOST_TEST_NE( sv1, "1" );
+        BOOST_TEST_NE( "1", sv1 );
+
+        BOOST_TEST_EQ( sv3, "123" );
+        BOOST_TEST_EQ( "123", sv3 );
+
+        BOOST_TEST_NE( sv3, "122" );
+        BOOST_TEST_NE( "122", sv3 );
+
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+
+        BOOST_TEST_EQ( sv1, std::string_view( "" ) );
+        BOOST_TEST_EQ( std::string_view( "" ), sv1 );
+
+        BOOST_TEST_NE( sv1, std::string_view( "1" ) );
+        BOOST_TEST_NE( std::string_view( "1" ), sv1 );
+
+        BOOST_TEST_EQ( sv3, std::string_view( "123" ) );
+        BOOST_TEST_EQ( std::string_view( "123" ), sv3 );
+
+        BOOST_TEST_NE( sv3, std::string_view( "122" ) );
+        BOOST_TEST_NE( std::string_view( "122" ), sv3 );
+
+#endif
+    }
+
+    return boost::report_errors();
+}