118 lines
2.7 KiB
C++
118 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <istream>
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// template <class charT, class traits>
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// basic_istream<charT,traits>&
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// ws(basic_istream<charT,traits>& is);
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#include <istream>
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#include <cassert>
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#include "test_macros.h"
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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(int, char**)
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{
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{
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testbuf<char> sb(" 123");
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std::istream is(&sb);
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ws(is);
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assert(is.good());
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assert(is.peek() == '1');
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}
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{
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testbuf<wchar_t> sb(L" 123");
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std::wistream is(&sb);
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ws(is);
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assert(is.good());
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assert(is.peek() == L'1');
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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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ws(is);
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assert(!is.fail());
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assert(is.eof());
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ws(is);
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assert(is.eof());
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assert(is.fail());
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}
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{
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testbuf<wchar_t> sb(L" ");
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std::wistream is(&sb);
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ws(is);
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assert(!is.fail());
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assert(is.eof());
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ws(is);
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assert(is.eof());
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assert(is.fail());
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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testbuf<char> sb(" ");
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std::basic_istream<char> is(&sb);
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is.exceptions(std::ios_base::eofbit);
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bool threw = false;
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try {
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std::ws(is);
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} catch (std::ios_base::failure const&) {
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threw = true;
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}
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assert(!is.bad());
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assert(!is.fail());
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assert( is.eof());
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assert(threw);
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}
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{
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testbuf<wchar_t> sb(L" ");
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std::basic_istream<wchar_t> is(&sb);
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is.exceptions(std::ios_base::eofbit);
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bool threw = false;
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try {
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std::ws(is);
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} catch (std::ios_base::failure const&) {
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threw = true;
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}
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assert(!is.bad());
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assert(!is.fail());
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assert( is.eof());
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assert(threw);
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}
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#endif
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return 0;
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}
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