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