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-rw-r--r--apt-pkg/contrib/mmap.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/apt-pkg/contrib/mmap.h b/apt-pkg/contrib/mmap.h
index e9baa9339..2bf2c1540 100644
--- a/apt-pkg/contrib/mmap.h
+++ b/apt-pkg/contrib/mmap.h
@@ -62,6 +62,7 @@ class MMap
inline void *Data() {return Base;};
inline unsigned long Size() {return iSize;};
inline void AddSize(unsigned long const size) {iSize += size;};
+ inline bool validData() const { return Base != (void *)-1 && Base != 0; };
// File manipulators
bool Sync();