| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // <streambuf> |
| 10 | |
| 11 | // template <class charT, class traits = char_traits<charT> > |
| 12 | // class basic_streambuf; |
| 13 | |
| 14 | // int_type sputbackc(char_type c); |
| 15 | |
| 16 | #include <streambuf> |
| 17 | #include <cassert> |
| 18 | |
| 19 | #include "test_macros.h" |
| 20 | |
| 21 | int pbackfail_called = 0; |
| 22 | |
| 23 | struct test |
| 24 | : public std::basic_streambuf<char> |
| 25 | { |
| 26 | typedef std::basic_streambuf<char> base; |
| 27 | |
| 28 | test() {} |
| 29 | |
| 30 | void setg(char* gbeg, char* gnext, char* gend) |
| 31 | { |
| 32 | base::setg(gbeg: gbeg, gnext: gnext, gend: gend); |
| 33 | } |
| 34 | |
| 35 | protected: |
| 36 | int_type pbackfail(int_type = traits_type::eof()) |
| 37 | { |
| 38 | ++pbackfail_called; |
| 39 | return 'a'; |
| 40 | } |
| 41 | }; |
| 42 | |
| 43 | int main(int, char**) |
| 44 | { |
| 45 | { |
| 46 | test t; |
| 47 | assert(pbackfail_called == 0); |
| 48 | assert(t.sputbackc('A') == 'a'); |
| 49 | assert(pbackfail_called == 1); |
| 50 | char in[] = "ABC"; |
| 51 | t.setg(gbeg: in, gnext: in+1, gend: in+sizeof(in)); |
| 52 | assert(t.sputbackc('A') == 'A'); |
| 53 | assert(pbackfail_called == 1); |
| 54 | assert(t.sputbackc('A') == 'a'); |
| 55 | assert(pbackfail_called == 2); |
| 56 | } |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 |