vendor/llvm/llvm-trunk-r306325

1 files changed, 28 insertions, 0 deletions

diff --git a/include/llvm/ADT/StringExtras.h b/include/llvm/ADT/StringExtras.h
index ffcf998a3d323..cc32bf43f29c8 100644
--- a/include/llvm/ADT/StringExtras.h
+++ b/include/llvm/ADT/StringExtras.h
@@ -15,10 +15,12 @@
 #define LLVM_ADT_STRINGEXTRAS_H
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include <cassert>
 #include <cstddef>
 #include <cstdint>
+#include <cstdlib>
 #include <cstring>
 #include <iterator>
 #include <string>
@@ -129,6 +131,32 @@ template <typename N> bool to_integer(StringRef S, N &Num, unsigned Base = 0) {
   return !S.getAsInteger(Base, Num);
 }
 
+namespace detail {
+template <typename N>
+inline bool to_float(const Twine &T, N &Num, N (*StrTo)(const char *, char **)) {
+  SmallString<32> Storage;
+  StringRef S = T.toNullTerminatedStringRef(Storage);
+  char *End;
+  N Temp = StrTo(S.data(), &End);
+  if (*End != '\0')
+    return false;
+  Num = Temp;
+  return true;
+}
+}
+
+inline bool to_float(const Twine &T, float &Num) {
+  return detail::to_float(T, Num, strtof);
+}
+
+inline bool to_float(const Twine &T, double &Num) {
+  return detail::to_float(T, Num, strtod);
+}
+
+inline bool to_float(const Twine &T, long double &Num) {
+  return detail::to_float(T, Num, strtold);
+}
+
 static inline std::string utostr(uint64_t X, bool isNeg = false) {
   char Buffer[21];
   char *BufPtr = std::end(Buffer);