From f4f39e74fae3c8b8d8fdb2f560e8a50777b6de1d Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sat, 20 May 2017 02:47:57 +0300
Subject: don't load the same PDB twice

---
 include/pdb/utils/file.hpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'include/pdb/utils')

diff --git a/include/pdb/utils/file.hpp b/include/pdb/utils/file.hpp
index 5b83f2b..50975aa 100644
--- a/include/pdb/utils/file.hpp
+++ b/include/pdb/utils/file.hpp
@@ -5,14 +5,44 @@
 
 #pragma once
 
+#include <Windows.h>
+
 #include <cstddef>
+#include <cstring>
 
+#include <functional>
 #include <string>
+#include <type_traits>
 
 namespace pdb
 {
     namespace file
     {
         std::size_t get_size(const std::string&);
+
+        struct ID
+        {
+            const FILE_ID_INFO raw;
+
+            bool operator==(const ID& other) const
+            {
+                static_assert(std::is_pod<FILE_ID_INFO>::value, "Can't memcmp if file IDs aren't PODs");
+                return 0 == std::memcmp(&raw, &other.raw, sizeof(FILE_ID_INFO));
+            }
+        };
+
+        ID query_id(const std::string&);
     }
 }
+
+namespace std
+{
+    template <>
+    struct hash<pdb::file::ID>
+    {
+        std::size_t operator()(const pdb::file::ID& id) const
+        {
+            return _Bitwise_hash<FILE_ID_INFO>{}(id.raw);
+        }
+    };
+}
-- 
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