Merge pull request #700 from evoskuil/master

Add is_validateable().

Author: evoskuil

include/bitcoin/database/impl/query/validate.ipp

@@ -29,6 +29,19 @@ namespace database {
 // States.
 // ----------------------------------------------------------------------------
 
+TEMPLATE
+bool CLASS::is_validateable(size_t height) const NOEXCEPT
+{
+    const auto ec = get_block_state(to_candidate(height));
+
+    // First block state should be unvalidated, valid, or confirmable.
+    return
+        (ec == database::error::unvalidated) ||
+        (ec == database::error::block_valid) ||
+        (ec == database::error::unknown_state) ||
+        (ec == database::error::block_confirmable);
+}
+
 // protected
 TEMPLATE
 inline code CLASS::to_block_code(

include/bitcoin/database/query.hpp

@@ -457,6 +457,7 @@ class query
     /// -----------------------------------------------------------------------
 
     /// States.
+    bool is_validateable(size_t height) const NOEXCEPT;
     uint64_t get_tx_fee(const tx_link& link) const NOEXCEPT;
     uint64_t get_block_fees(const header_link& link) const NOEXCEPT;
     code get_block_state(const header_link& link) const NOEXCEPT;