raw_ostream: add operator<< overload for std::error_code

Summary:
The main motivation for this is unit tests, which contain a large macro
for pretty-printing std::error_code, and this macro is duplicated in
every file that needs to do this. However, the functionality may be
useful elsewhere too.

In this patch I have reimplemented the existing ASSERT_NO_ERROR macros
to reuse the new functionality, but I have kept the macro (as a
one-liner) as it is slightly more readable than ASSERT_EQ(...,
std::error_code()).

Reviewers: sammccall, ilya-biryukov

Subscribers: zturner, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65643

llvm-svn: 368849

1 files changed, 1 insertions, 8 deletions

diff --git a/llvm/unittests/Support/ReplaceFileTest.cpp b/llvm/unittests/Support/ReplaceFileTest.cpp
index d2273d77f5e..9a870a78360 100644
--- a/llvm/unittests/Support/ReplaceFileTest.cpp
+++ b/llvm/unittests/Support/ReplaceFileTest.cpp
@@ -17,14 +17,7 @@
 using namespace llvm;
 using namespace llvm::sys;
 
-#define ASSERT_NO_ERROR(x)                                                 \
-  do {                                                                     \
-    if (std::error_code ASSERT_NO_ERROR_ec = x) {                          \
-      errs() << #x ": did not return errc::success.\n"                     \
-             << "error number: " << ASSERT_NO_ERROR_ec.value() << "\n"     \
-             << "error message: " << ASSERT_NO_ERROR_ec.message() << "\n"; \
-    }                                                                      \
-  } while (false)
+#define ASSERT_NO_ERROR(x) ASSERT_EQ(x, std::error_code())
 
 namespace {
 std::error_code CreateFileWithContent(const SmallString<128> &FilePath,