diff --git a/src/containers/pivector.h b/src/containers/pivector.h
index afba8fa9..588e6e16 100755
--- a/src/containers/pivector.h
+++ b/src/containers/pivector.h
@@ -195,6 +195,8 @@ public:
 	bool operator !=(const PIVector<T> & t) const {if (piv_size != t.piv_size) return true; for (size_t i = 0; i < piv_size; ++i) if (t[i] != piv_data[i]) return true; return false;}
 	bool contains(const T & v) const {for (size_t i = 0; i < piv_size; ++i) if (v == piv_data[i]) return true; return false;}
 	int etries(const T & v) const {int ec = 0; for (size_t i = 0; i < piv_size; ++i) if (v == piv_data[i]) ++ec; return ec;}
+	ssize_t indexOf(const T & v) const {for (ssize_t i = 0; i < piv_size; ++i) if (v == piv_data[i]) return i; return -1;}
+	ssize_t lastIndexOf(const T & v) const {for (ssize_t i = piv_size - 1; i >= 0; --i) if (v == piv_data[i]) return i; return -1;}
 
 	T * data(size_t index = 0) {return &(piv_data[index]);}
 	const T * data(size_t index = 0) const {return &(piv_data[index]);}