[ADT] Move drop_begin from iterator_range.h into STLExtras.
Summary:
drop_begin depends on adl_begin/adl_end, which are defined in STLExtras.h,
but we can't just #include STLExtras.h in iterator_range.h as that would
introduce a circular reference (STLExtras.h already depends on
iterator_range.h). The simplest solution is to move drop_begin into
STLExtras.h, which is a reasonable home for it anyway.
Reviewers: dblaikie
Subscribers: dexonsmith, ributzka, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D70189
diff --git a/llvm/unittests/ADT/STLExtrasTest.cpp b/llvm/unittests/ADT/STLExtrasTest.cpp
index 4cbef90..d0220e3 100644
--- a/llvm/unittests/ADT/STLExtrasTest.cpp
+++ b/llvm/unittests/ADT/STLExtrasTest.cpp
@@ -380,6 +380,19 @@
EXPECT_FALSE(llvm::empty(R1));
}
+TEST(STLExtrasTest, DropBeginTest) {
+ SmallVector<int, 5> vec{0, 1, 2, 3, 4};
+
+ for (int n = 0; n < 5; ++n) {
+ int i = n;
+ for (auto &v : drop_begin(vec, n)) {
+ EXPECT_EQ(v, i);
+ i += 1;
+ }
+ EXPECT_EQ(i, 5);
+ }
+}
+
TEST(STLExtrasTest, EarlyIncrementTest) {
std::list<int> L = {1, 2, 3, 4};