1 files changed, 76 insertions, 0 deletions
diff --git a/libcxx/test/std/experimental/string.view/string.view.modifiers/remove_prefix.pass.cpp b/libcxx/test/std/experimental/string.view/string.view.modifiers/remove_prefix.pass.cpp
new file mode 100644
index 00000000000..0a2dd6d9329
--- /dev/null
+++ b/libcxx/test/std/experimental/string.view/string.view.modifiers/remove_prefix.pass.cpp
@@ -0,0 +1,76 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void remove_prefix(size_type _n)
+
+#include <experimental/string_view>
+#include <cassert>
+#include <iostream>
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::experimental::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    if ( len > 0 ) {
+        sv1.remove_prefix ( 1 );
+        assert ( sv1.size() == (len - 1));
+        assert ( sv1.data() == (s + 1));
+        sv1.remove_prefix ( len - 1 );
+    }
+    
+    assert ( sv1.size() == 0 );
+    sv1.remove_prefix ( 0 );
+    assert ( sv1.size() == 0 ); 
+    }
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n, size_t k ) {
+    typedef std::experimental::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.remove_prefix ( k );
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    static_assert ( test_ce ( 5, 0 ) == 5, "" );
+    static_assert ( test_ce ( 5, 1 ) == 4, "" );
+    static_assert ( test_ce ( 5, 5 ) == 0, "" );
+    static_assert ( test_ce ( 9, 3 ) == 6, "" );
+    }
+#endif
+}