[libcxx-commits] [libcxx] [libc++][print] Adds ostream overloads. (PR #73262)

[Louis Dionne via libcxx-commits]

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@@ -0,0 +1,193 @@
+//===----------------------------------------------------------------------===//
+// 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: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
+
+// TODO PRINT Investigate see https://reviews.llvm.org/D156585
+// UNSUPPORTED: no-filesystem
+
+// XFAIL: availability-fp_to_chars-missing
+// XFAIL: availability-print-missing
+
+// <ostream>
+
+// template<class... Args>
+//   void print(ostream& os, format_string<Args...> fmt, Args&&... args);
+
+// [ostream.formatted.print]/3
+//   If the function is vprint_unicode and os is a stream that refers to
+//   a terminal capable of displaying Unicode which is determined in an
+//   implementation-defined manner, writes out to the terminal using the
+//   native Unicode API;
+// This is tested in
+// test/libcxx/input.output/iostream.format/output.streams/ostream.formatted/ostream.formatted.print/vprint_unicode.pass.cpp
+
+#include <cassert>
+#include <ostream>
+#include <sstream>
+
+#include "assert_macros.h"
+#include "concat_macros.h"
+#include "print_tests.h"
+#include "test_format_string.h"
+#include "test_macros.h"
+
+auto test_file = []<class... Args>(std::string_view expected, test_format_string<char, Args...> fmt, Args&&... args) {
+  std::stringstream sstr;
+  std::print(sstr, fmt, std::forward<Args>(args)...);
+
+  std::string out = sstr.str();
+  TEST_REQUIRE(out == expected,
+               TEST_WRITE_CONCATENATED(
+                   "\nFormat string   ", fmt.get(), "\nExpected output ", expected, "\nActual output   ", out, '\n'));
+};
+
+auto test_exception = []<class... Args>(std::string_view, std::string_view, Args&&...) {
+  // After P2216 most exceptions thrown by std::format become ill-formed.
+  // Therefore this tests does nothing.
+  // A basic ill-formed test is done in format.verify.cpp
+  // The exceptions are tested by other functions that don't use the basic-format-string as fmt argument.
+};
+// [ostream.formatted.print]/3.2
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ldionne wrote:

Nit: Maybe add a newline? Also applies in other files.

https://github.com/llvm/llvm-project/pull/73262