1 files changed, 42 insertions, 0 deletions
diff --git a/src/boost/libs/lambda2/test/stream_extract.cpp b/src/boost/libs/lambda2/test/stream_extract.cpp
new file mode 100644
index 000000000..4cfc0cf67
--- /dev/null
+++ b/src/boost/libs/lambda2/test/stream_extract.cpp
@@ -0,0 +1,42 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/lambda2.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+#include <string>
+
+template<class T> T from_string_1( std::string const& s )
+{
+    using namespace boost::lambda2;
+
+    std::istringstream is( s );
+
+    T t{};
+
+    ( std::ref( is ) >> _1 )( t );
+
+    return t;
+}
+
+template<class T> T from_string_2( std::string const& s )
+{
+    using namespace boost::lambda2;
+
+    std::istringstream is( s );
+
+    T t{};
+
+    ( is >> _1 )( t );
+
+    return t;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( from_string_1<int>( "123" ), 123 );
+    BOOST_TEST_EQ( from_string_2<int>( "456" ), 456 );
+
+    return boost::report_errors();
+}