fixed google hash map support

1 files changed, 1 insertions, 0 deletions

diff --git a/ripser.cpp b/ripser.cpp
index 65d84d7..55e94b5 100644
--- a/ripser.cpp
+++ b/ripser.cpp
@@ -108,6 +108,7 @@ struct __attribute__((packed)) entry_t {
 	coefficient_t coefficient;
 	entry_t(index_t _index, coefficient_t _coefficient)
 	    : index(_index), coefficient(_coefficient) {}
+	entry_t(index_t _index) : index(_index), coefficient(0) {}
 	entry_t() : index(0), coefficient(0) {}
 };