Add tx.spends().

Author: evoskuil

include/bitcoin/system/chain/transaction.hpp

@@ -92,6 +92,7 @@ class BC_API transaction
 
     /// Native properties.
     bool is_valid() const NOEXCEPT;
+    size_t spends() const NOEXCEPT;
     size_t inputs() const NOEXCEPT;
     size_t outputs() const NOEXCEPT;
     uint32_t version() const NOEXCEPT;

src/chain/transaction.cpp

@@ -349,6 +349,11 @@ bool transaction::is_valid() const NOEXCEPT
     return valid_;
 }
 
+size_t transaction::spends() const NOEXCEPT
+{
+    return is_coinbase() ? zero : inputs_->size();
+}
+
 size_t transaction::inputs() const NOEXCEPT
 {
     return inputs_->size();