Merge pull request #685 from evoskuil/master

Add data_slab cast operator to accessor, accommodates system change.

Author: evoskuil

include/bitcoin/database/impl/memory/accessor.ipp

@@ -66,13 +66,25 @@ inline ptrdiff_t CLASS::size() const NOEXCEPT
 }
 
 TEMPLATE
-inline uint8_t* CLASS::begin() NOEXCEPT
+inline uint8_t* CLASS::data() const NOEXCEPT
+{
+    return begin();
+}
+
+TEMPLATE
+inline CLASS::operator system::data_slab() const NOEXCEPT
+{
+    return { begin(), end() };
+};
+
+TEMPLATE
+inline uint8_t* CLASS::begin() const NOEXCEPT
 {
     return begin_;
 }
 
 TEMPLATE
-inline uint8_t* CLASS::end() NOEXCEPT
+inline uint8_t* CLASS::end() const NOEXCEPT
 {
     return end_;
 }

include/bitcoin/database/memory/accessor.hpp

@@ -50,12 +50,13 @@ class accessor
     /// The logical buffer size (from begin to end).
     inline ptrdiff_t size() const NOEXCEPT override;
 
-    /// Get logical buffer (guarded against remap only).
-    inline uint8_t* begin() NOEXCEPT override;
-    inline uint8_t* end() NOEXCEPT override;
-
     /// Alias for begin.
-    inline uint8_t* data() NOEXCEPT override { return begin(); }
+    inline uint8_t* data() const NOEXCEPT override;
+
+    /// Get logical buffer (guarded against remap only).
+    inline operator system::data_slab() const NOEXCEPT override;
+    inline uint8_t* begin() const NOEXCEPT override;
+    inline uint8_t* end() const NOEXCEPT override;
 
 private:
     uint8_t* begin_{};

include/bitcoin/database/memory/interfaces/memory.hpp

@@ -41,12 +41,13 @@ class memory
     /// The logical buffer size (from begin to end).
     virtual ptrdiff_t size() const NOEXCEPT = 0;
 
-    /// Get logical buffer.
-    virtual uint8_t* begin() NOEXCEPT = 0;
-    virtual uint8_t* end() NOEXCEPT = 0;
-
     /// Alias begin.
-    virtual uint8_t* data() NOEXCEPT = 0;
+    virtual uint8_t* data() const NOEXCEPT = 0;
+
+    /// Get logical buffer.
+    virtual operator system::data_slab() const NOEXCEPT = 0;
+    virtual uint8_t* begin() const NOEXCEPT = 0;
+    virtual uint8_t* end() const NOEXCEPT = 0;
 };
 
 typedef memory::ptr memory_ptr;