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85 lines
2.4 KiB
C++
85 lines
2.4 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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// <locale>
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// wbuffer_convert<Codecvt, Elem, Tr>
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// int_type underflow();
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// This test is not entirely portable
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#include <locale>
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#include <codecvt>
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#include <fstream>
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#include <cassert>
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struct test_buf
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: public std::wbuffer_convert<std::codecvt_utf8<wchar_t> >
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{
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typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > base;
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typedef base::char_type char_type;
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typedef base::int_type int_type;
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typedef base::traits_type traits_type;
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explicit test_buf(std::streambuf* sb) : base(sb) {}
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char_type* eback() const {return base::eback();}
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char_type* gptr() const {return base::gptr();}
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char_type* egptr() const {return base::egptr();}
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void gbump(int n) {base::gbump(n);}
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virtual int_type underflow() {return base::underflow();}
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};
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int main()
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{
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{
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std::ifstream bs("underflow.dat");
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test_buf f(bs.rdbuf());
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assert(f.eback() == 0);
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assert(f.gptr() == 0);
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assert(f.egptr() == 0);
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assert(f.underflow() == L'1');
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assert(f.eback() != 0);
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assert(f.eback() == f.gptr());
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assert(*f.gptr() == L'1');
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assert(f.egptr() - f.eback() == 9);
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}
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{
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std::ifstream bs("underflow.dat");
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test_buf f(bs.rdbuf());
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assert(f.eback() == 0);
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assert(f.gptr() == 0);
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assert(f.egptr() == 0);
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assert(f.underflow() == L'1');
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assert(f.eback() != 0);
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assert(f.eback() == f.gptr());
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assert(*f.gptr() == L'1');
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assert(f.egptr() - f.eback() == 9);
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f.gbump(8);
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assert(f.sgetc() == L'9');
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assert(f.eback()[0] == L'1');
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assert(f.eback()[1] == L'2');
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assert(f.eback()[2] == L'3');
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assert(f.eback()[3] == L'4');
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assert(f.gptr() - f.eback() == 8);
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assert(*f.gptr() == L'9');
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assert(f.egptr() - f.gptr() == 1);
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}
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{
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std::ifstream bs("underflow_utf8.dat");
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test_buf f(bs.rdbuf());
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assert(f.sbumpc() == 0x4E51);
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assert(f.sbumpc() == 0x4E52);
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assert(f.sbumpc() == 0x4E53);
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assert(f.sbumpc() == test_buf::traits_type::eof());
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}
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}
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