b64f8b07c1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
101 lines
2.5 KiB
C++
101 lines
2.5 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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// <istream>
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// int_type get();
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#include <istream>
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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_streambuf<CharT>
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{
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typedef std::basic_string<CharT> string_type;
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typedef std::basic_streambuf<CharT> base;
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private:
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string_type str_;
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public:
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testbuf() {}
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testbuf(const string_type& str)
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: str_(str)
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{
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base::setg(const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()) + str_.size());
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}
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CharT* eback() const {return base::eback();}
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CharT* gptr() const {return base::gptr();}
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CharT* egptr() const {return base::egptr();}
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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(" ");
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std::istream is(&sb);
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char c = is.get();
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assert(!is.eof());
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assert(!is.fail());
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assert(c == ' ');
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assert(is.gcount() == 1);
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}
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{
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testbuf<char> sb(" abc");
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std::istream is(&sb);
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char c = is.get();
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assert(!is.eof());
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assert(!is.fail());
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assert(c == ' ');
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assert(is.gcount() == 1);
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c = is.get();
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assert(!is.eof());
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assert(!is.fail());
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assert(c == 'a');
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assert(is.gcount() == 1);
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c = is.get();
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assert(!is.eof());
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assert(!is.fail());
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assert(c == 'b');
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assert(is.gcount() == 1);
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c = is.get();
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assert( is.eof());
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assert(!is.fail());
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assert(c == 'c');
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assert(is.gcount() == 1);
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}
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{
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testbuf<wchar_t> sb(L" abc");
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std::wistream is(&sb);
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wchar_t c = is.get();
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assert(!is.eof());
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assert(!is.fail());
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assert(c == L' ');
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assert(is.gcount() == 1);
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c = is.get();
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assert(!is.eof());
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assert(!is.fail());
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assert(c == L'a');
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assert(is.gcount() == 1);
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c = is.get();
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assert(!is.eof());
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assert(!is.fail());
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assert(c == L'b');
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assert(is.gcount() == 1);
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c = is.get();
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assert( is.eof());
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assert(!is.fail());
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assert(c == L'c');
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assert(is.gcount() == 1);
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}
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}
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