Fix std::unique_ptr custom deleter issue

Somehow the previous custom deleter for xercesc::DOMDocument fails
invokable assertions planet a compiler update. A lambda function
with the same signature wors for some reason…

2 files changed, 10 insertions, 14 deletions

diff --git a/src/support/dom/document_cache.cc b/src/support/dom/document_cache.cc
index c000aef..0133234 100644
--- a/src/support/dom/document_cache.cc
+++ b/src/support/dom/document_cache.cc
@@ -11,7 +11,10 @@ namespace InputXSLT {
 
 auto DomDocumentCache::createDocument() -> document_ptr {
 	return document_ptr(
-		xercesc::DOMImplementation::getImplementation()->createDocument()
+		xercesc::DOMImplementation::getImplementation()->createDocument(),
+		[](xercesc::DOMDocument* ptr) {
+			ptr->release();
+		}
 	);
 }
 
@@ -21,7 +24,10 @@ auto DomDocumentCache::createDocument(const std::string& name) -> document_ptr {
 			nullptr,
 			*XercesStringGuard<XMLCh>(name),
 			nullptr
-		)
+		),
+		[](xercesc::DOMDocument* ptr) {
+			ptr->release();
+		}
 	);
 }
 
@@ -41,9 +47,4 @@ xalan::XalanDocument* DomDocumentCache::create(document_ptr&& document) {
 	return this->cache_.top()->getXalanDocument();
 }
 
-void DomDocumentCache::document_deleter::operator()(
-	xercesc::DOMDocument* document) {
-	document->release();
-}
-
 }
diff --git a/src/support/dom/document_cache.h b/src/support/dom/document_cache.h
index f472249..115d194 100644
--- a/src/support/dom/document_cache.h
+++ b/src/support/dom/document_cache.h
@@ -8,22 +8,17 @@
 #include <mutex>
 #include <stack>
 #include <memory>
+#include <functional>
 
 #include "common.h"
 
 namespace InputXSLT {
 
 class DomDocumentCache {
-	class document_deleter {
-		friend std::unique_ptr<xercesc::DOMDocument, document_deleter>;
-
-		void operator()(xercesc::DOMDocument*);
-	};
-
 	public:
 		typedef std::unique_ptr<
 			xercesc::DOMDocument,
-			document_deleter
+			std::function<void(xercesc::DOMDocument*)>
 		> document_ptr;
 
 		static document_ptr createDocument();