test/std/input.output/iostream.format/std.manip/setprecision.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <iomanip>

// T5 setprecision(int n);

#include <iomanip>
#include <istream>
#include <ostream>
#include <cassert>

#include "test_macros.h"

template <class CharT>
struct testbuf
    : public std::basic_streambuf<CharT>
{
    testbuf() {}
};

int main(int, char**)
{
    {
        testbuf<char> sb;
        std::istream is(&sb);
        is >> std::setprecision(10);
        assert(is.precision() == 10);
    }
    {
        testbuf<char> sb;
        std::ostream os(&sb);
        os << std::setprecision(10);
        assert(os.precision() == 10);
    }
    {
        testbuf<wchar_t> sb;
        std::wistream is(&sb);
        is >> std::setprecision(10);
        assert(is.precision() == 10);
    }
    {
        testbuf<wchar_t> sb;
        std::wostream os(&sb);
        os << std::setprecision(10);
        assert(os.precision() == 10);
    }

  return 0;
}