util/{Const,Writable}Buffer: add operator==(nullptr_t)

3 files changed, 40 insertions, 0 deletions

diff --git a/src/util/AllocatedArray.hxx b/src/util/AllocatedArray.hxx
index 1a726a323..3b14eb114 100644
--- a/src/util/AllocatedArray.hxx
+++ b/src/util/AllocatedArray.hxx
@@ -100,6 +100,14 @@ public:
 		return buffer.IsNull();
 	}
 
+	constexpr bool operator==(std::nullptr_t) const {
+		return buffer == nullptr;
+	}
+
+	constexpr bool operator!=(std::nullptr_t) const {
+		return buffer != nullptr;
+	}
+
 	/**
 	 * Returns true if no memory was allocated so far.
 	 */
diff --git a/src/util/ConstBuffer.hxx b/src/util/ConstBuffer.hxx
index 8d36ac08b..9e780d78b 100644
--- a/src/util/ConstBuffer.hxx
+++ b/src/util/ConstBuffer.hxx
@@ -76,6 +76,14 @@ struct ConstBuffer<void> {
 		return data == nullptr;
 	}
 
+	constexpr bool operator==(std::nullptr_t) const {
+		return data == nullptr;
+	}
+
+	constexpr bool operator!=(std::nullptr_t) const {
+		return data != nullptr;
+	}
+
 	constexpr bool IsEmpty() const {
 		return size == 0;
 	}
@@ -143,6 +151,14 @@ struct ConstBuffer {
 		return data == nullptr;
 	}
 
+	constexpr bool operator==(std::nullptr_t) const {
+		return data == nullptr;
+	}
+
+	constexpr bool operator!=(std::nullptr_t) const {
+		return data != nullptr;
+	}
+
 	constexpr bool IsEmpty() const {
 		return size == 0;
 	}
diff --git a/src/util/WritableBuffer.hxx b/src/util/WritableBuffer.hxx
index 8272b012d..3155d5503 100644
--- a/src/util/WritableBuffer.hxx
+++ b/src/util/WritableBuffer.hxx
@@ -68,6 +68,14 @@ struct WritableBuffer<void> {
 		return data == nullptr;
 	}
 
+	constexpr bool operator==(std::nullptr_t) const {
+		return data == nullptr;
+	}
+
+	constexpr bool operator!=(std::nullptr_t) const {
+		return data != nullptr;
+	}
+
 	constexpr bool IsEmpty() const {
 		return size == 0;
 	}
@@ -137,6 +145,14 @@ struct WritableBuffer {
 		return data == nullptr;
 	}
 
+	constexpr bool operator==(std::nullptr_t) const {
+		return data == nullptr;
+	}
+
+	constexpr bool operator!=(std::nullptr_t) const {
+		return data != nullptr;
+	}
+
 	constexpr bool IsEmpty() const {
 		return size == 0;
 	}