Optimize start lookup

1 files changed, 9 insertions, 0 deletions

diff --git a/minicc.h b/minicc.h
index d3135c6..92678a1 100644
--- a/minicc.h
+++ b/minicc.h
@@ -34,3 +34,12 @@ struct Token {
 // For printing via Google Test
 bool operator==(const Token &a, const Token &b);
 std::ostream& operator<<(std::ostream& os, const Token& token);
+
+struct PairHashSS {
+ size_t operator()(const std::pair<std::string,std::string>& p) const noexcept
+ {
+  size_t h0 {std::hash<std::string>{}(p.first)};
+  size_t h1 {std::hash<std::string>{}(p.second)};
+  return h0 ^ (h1 << 1);
+ }
+};