[Support] Add StringRef::getAsDouble.

Differential Revision: https://reviews.llvm.org/D29918

llvm-svn: 295089

1 files changed, 21 insertions, 0 deletions

diff --git a/llvm/unittests/ADT/StringRefTest.cpp b/llvm/unittests/ADT/StringRefTest.cpp
index 5b6822e..614ec5d 100644
--- a/llvm/unittests/ADT/StringRefTest.cpp
+++ b/llvm/unittests/ADT/StringRefTest.cpp
@@ -852,6 +852,27 @@ TEST(StringRefTest, consumeIntegerSigned) {
   }
 }
 
+struct GetDoubleStrings {
+  const char *Str;
+  bool AllowInexact;
+  bool ShouldFail;
+  double D;
+} DoubleStrings[] = {{"0", false, false, 0.0},
+                     {"0.0", false, false, 0.0},
+                     {"-0.0", false, false, -0.0},
+                     {"123.45", false, true, 123.45},
+                     {"123.45", true, false, 123.45}};
+
+TEST(StringRefTest, getAsDouble) {
+  for (const auto &Entry : DoubleStrings) {
+    double Result;
+    StringRef S(Entry.Str);
+    EXPECT_EQ(Entry.ShouldFail, S.getAsDouble(Result, Entry.AllowInexact));
+    if (!Entry.ShouldFail)
+      EXPECT_EQ(Result, Entry.D);
+  }
+}
+
 static const char *join_input[] = { "a", "b", "c" };
 static const char join_result1[] = "a";
 static const char join_result2[] = "a:b:c";