Implement deduction guides for basic_regex

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@333050 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/re/re.regex/re.regex.construct/deduct.fail.cpp

@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <regex>
+// UNSUPPORTED: c++98, c++03, c++11, c++14
+// UNSUPPORTED: libcpp-no-deduction-guides
+
+
+// template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
+//    vector(InputIterator, InputIterator, Allocator = Allocator())
+//    -> vector<typename iterator_traits<InputIterator>::value_type, Allocator>;
+//
+
+
+#include <regex>
+#include <string>
+#include <iterator>
+#include <cassert>
+#include <cstddef>
+
+
+int main()
+{  
+//  Test the explicit deduction guides
+    {
+//	basic_regex(ForwardIterator, ForwardIterator)
+//  <int> is not an iterator
+    std::basic_regex re(23, 34);   // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'basic_regex'}}
+    }
+
+    {
+//	basic_regex(ForwardIterator, ForwardIterator, flag_type)
+//  <double> is not an iterator
+    std::basic_regex re(23.0, 34.0, std::regex_constants::basic);   // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'basic_regex'}}
+    }
+
+//  Test the implicit deduction guides
+
+}