[Support] Make support types more easily printable.
Summary:
Error's new operator<< is the first way to print an error without consuming it.
formatv() can now print objects with an operator<< that works with raw_ostream.
Reviewers: bkramer
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D48966
llvm-svn: 336412
diff --git a/llvm/unittests/Support/FormatVariadicTest.cpp b/llvm/unittests/Support/FormatVariadicTest.cpp
index 54373da..6d62146 100644
--- a/llvm/unittests/Support/FormatVariadicTest.cpp
+++ b/llvm/unittests/Support/FormatVariadicTest.cpp
@@ -671,3 +671,12 @@
EXPECT_EQ(0, R.Copied);
EXPECT_EQ(0, R.Moved);
}
+
+namespace adl {
+struct X {};
+raw_ostream &operator<<(raw_ostream &OS, const X &) { return OS << "X"; }
+} // namespace adl
+TEST(FormatVariadicTest, FormatStreamable) {
+ adl::X X;
+ EXPECT_EQ("X", formatv("{0}", X).str());
+}