forked from OSchip/llvm-project
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <sstream>
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// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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// class basic_stringbuf
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// int_type underflow();
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#include <sstream>
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#include <cassert>
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template <class CharT>
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struct testbuf
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: public std::basic_stringbuf<CharT>
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{
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typedef std::basic_stringbuf<CharT> base;
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explicit testbuf(const std::basic_string<CharT>& str)
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: base(str) {}
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typename base::int_type underflow() {return base::underflow();}
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void pbump(int n) {base::pbump(n);}
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};
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int main()
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{
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{
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testbuf<char> sb("123");
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sb.pbump(3);
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assert(sb.underflow() == '1');
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assert(sb.underflow() == '1');
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assert(sb.snextc() == '2');
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assert(sb.underflow() == '2');
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assert(sb.underflow() == '2');
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assert(sb.snextc() == '3');
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assert(sb.underflow() == '3');
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assert(sb.underflow() == '3');
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assert(sb.snextc() == std::char_traits<char>::eof());
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assert(sb.underflow() == std::char_traits<char>::eof());
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assert(sb.underflow() == std::char_traits<char>::eof());
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sb.sputc('4');
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assert(sb.underflow() == '4');
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assert(sb.underflow() == '4');
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}
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{
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testbuf<wchar_t> sb(L"123");
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sb.pbump(3);
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assert(sb.underflow() == L'1');
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assert(sb.underflow() == L'1');
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assert(sb.snextc() == L'2');
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assert(sb.underflow() == L'2');
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assert(sb.underflow() == L'2');
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assert(sb.snextc() == L'3');
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assert(sb.underflow() == L'3');
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assert(sb.underflow() == L'3');
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assert(sb.snextc() == std::char_traits<wchar_t>::eof());
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assert(sb.underflow() == std::char_traits<wchar_t>::eof());
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assert(sb.underflow() == std::char_traits<wchar_t>::eof());
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sb.sputc(L'4');
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assert(sb.underflow() == L'4');
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assert(sb.underflow() == L'4');
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}
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}
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