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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: libcpp-has-no-localization
// <complex>
// template<class T, class charT, class traits>
// basic_ostream<charT, traits>&
// operator<<(basic_ostream<charT, traits>& o, const complex<T>& x);
#include <complex>
#include <sstream>
#include <cassert>
#include "test_macros.h"
int main(int, char**) {
// Basic test
{
std::complex<double> const c(1, 2);
std::ostringstream os;
os << c;
assert(os.str() == "(1,2)");
}
// Test with various widths.
// In particular, make sure the width() is 0 after the operation, which
// should be the case because [complex.ops] says about operator<< for complex:
//
// Effects: Inserts the complex number x onto the stream o as if it
// were implemented as follows:
//
// basic_ostringstream<charT, traits> s;
// s.flags(o.flags());
// s.imbue(o.getloc());
// s.precision(o.precision());
// s << '(' << x.real() << "," << x.imag() << ')';
// return o << s.str();
//
// Since operator<< for std::string sets o.width(0), operator<< for
// std::complex should do the same.
{
for (int width = 0; width <= 5; ++width) {
std::complex<double> const c(1, 2);
std::ostringstream os;
os.width(width);
os.fill('_');
os << c;
assert(os.width() == 0);
assert(os.str() == "(1,2)");
}
{
std::complex<double> const c(1, 2);
std::ostringstream os;
os.width(6);
os.fill('_');
os << c;
assert(os.width() == 0);
assert(os.str() == "_(1,2)");
}
{
std::complex<double> const c(1, 2);
std::ostringstream os;
os.width(7);
os.fill('_');
os << c;
assert(os.width() == 0);
assert(os.str() == "__(1,2)");
}
{
std::complex<double> const c(1, 2);
std::ostringstream os;
os.width(8);
os.fill('_');
os << c;
assert(os.width() == 0);
assert(os.str() == "___(1,2)");
}
// Insert something after the complex and make sure the
// stream's width has been reset as expected.
{
std::complex<double> const c(1, 2);
std::ostringstream os;
os.width(8);
os.fill('_');
os << c;
assert(os.width() == 0);
os << "hello";
assert(os.str() == "___(1,2)hello");
}
// Test with numbers that result in different output lengths, to
// make sure we handle custom width() correctly.
{
std::complex<double> const c(123, 456);
std::ostringstream os;
os.width(4);
os.fill('_');
os << c;
assert(os.width() == 0);
assert(os.str() == "(123,456)");
}
{
std::complex<double> const c(123, 456);
std::ostringstream os;
os.width(12);
os.fill('_');
os << c;
assert(os.width() == 0);
assert(os.str() == "___(123,456)");
os << "hello";
assert(os.str() == "___(123,456)hello");
}
// Make sure left fill behaves correctly
{
std::complex<double> const c(123, 456);
std::ostringstream os;
os.width(12);
os.fill('_');
os << std::left << c;
assert(os.width() == 0);
assert(os.str() == "(123,456)___");
os << "xy";
assert(os.str() == "(123,456)___xy");
}
}
return 0;
}
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