1 files changed, 76 insertions, 0 deletions
diff --git a/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp b/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp
new file mode 100644
index 00000000000..d7014868fd3
--- /dev/null
+++ b/libcxx/test/std/strings/strings.erasure/erase_if.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.
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <string>
+
+// template <class charT, class traits, class Allocator, class Predicate>
+//   void erase_if(basic_string<charT, traits, Allocator>& c, Predicate pred);  
+
+#include <string>
+
+#include "test_macros.h"
+#include "test_allocator.h"
+#include "min_allocator.h"
+
+template <class S, class Pred>
+void
+test0(S s, Pred p, S expected)
+{
+    ASSERT_SAME_TYPE(void, decltype(std::erase_if(s, p)));
+    std::erase_if(s, p);
+    LIBCPP_ASSERT(s.__invariants());
+    assert(s == expected);
+}
+
+template <typename S>
+void test()
+{
+    auto isA = [](auto ch) { return ch == 'a';};
+    auto isB = [](auto ch) { return ch == 'b';};
+    auto isC = [](auto ch) { return ch == 'c';};
+    auto isD = [](auto ch) { return ch == 'd';};
+    auto True  = [](auto) { return true; };
+    auto False = [](auto) { return false; };
+    
+    test0(S(""), isA, S(""));
+
+    test0(S("a"), isA, S(""));
+    test0(S("a"), isB, S("a"));
+
+    test0(S("ab"), isA, S("b"));
+    test0(S("ab"), isB, S("a"));
+    test0(S("ab"), isC, S("ab"));
+    test0(S("aa"), isA, S(""));
+    test0(S("aa"), isC, S("aa"));
+
+    test0(S("abc"), isA, S("bc"));
+    test0(S("abc"), isB, S("ac"));
+    test0(S("abc"), isC, S("ab"));
+    test0(S("abc"), isD, S("abc"));
+
+    test0(S("aab"), isA, S("b"));
+    test0(S("aab"), isB, S("aa"));
+    test0(S("aab"), isC, S("aab"));
+    test0(S("abb"), isA, S("bb"));
+    test0(S("abb"), isB, S("a"));
+    test0(S("abb"), isC, S("abb"));
+    test0(S("aaa"), isA, S(""));
+    test0(S("aaa"), isB, S("aaa"));
+
+    test0(S("aba"), False,  S("aba"));
+    test0(S("aba"), True,   S(""));
+}
+
+int main()
+{
+    test<std::string>();
+    test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>> ();
+    test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>> ();
+}