diff --git a/parallel_hashmap/phmap.h b/parallel_hashmap/phmap.h
index 6185a61..87812bd 100644
--- a/parallel_hashmap/phmap.h
+++ b/parallel_hashmap/phmap.h
@@ -357,7 +357,7 @@ inline size_t H1(size_t hashval, const ctrl_t* ) {
 #endif
 
 
-inline h2_t H2(size_t hashval)       { return (h2_t)(ctrl_t)(hashval & 0x7F); }
+inline ctrl_t H2(size_t hashval)       { return (ctrl_t)(hashval & 0x7F); }
 
 inline bool IsEmpty(ctrl_t c)          { return c == kEmpty; }
 inline bool IsFull(ctrl_t c)           { return c >= static_cast<ctrl_t>(0); }
@@ -4582,7 +4582,7 @@ struct HashtableDebugAccess<Set, typename std::enable_if<has_member_type_raw_has
         auto seq = set.probe(hashval);
         while (true) {
             priv::Group g{set.ctrl_ + seq.offset()};
-            for (uint32_t i : g.Match(priv::H2(hashval))) {
+            for (uint32_t i : g.Match((h2_t)priv::H2(hashval))) {
                 if (Traits::apply(
                         typename Set::template EqualElement<typename Set::key_type>{
                             key, set.eq_ref()},
diff --git a/parallel_hashmap/phmap_bits.h b/parallel_hashmap/phmap_bits.h
index 314e91d..5db8ab9 100644
--- a/parallel_hashmap/phmap_bits.h
+++ b/parallel_hashmap/phmap_bits.h
@@ -276,7 +276,7 @@ PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountLeadingZeros64Slow(uint64_t n) {
     if (n >> 16) zeroes -= 16, n >>= 16;
     if (n >> 8) zeroes -= 8, n >>= 8;
     if (n >> 4) zeroes -= 4, n >>= 4;
-    return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
+    return (uint32_t)("\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes);
 }
 
 PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountLeadingZeros64(uint64_t n) {
@@ -284,17 +284,17 @@ PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountLeadingZeros64(uint64_t n) {
     // MSVC does not have __buitin_clzll. Use _BitScanReverse64.
     unsigned long result = 0;  // NOLINT(runtime/int)
     if (_BitScanReverse64(&result, n)) {
-        return (int)(63 - result);
+        return (uint32_t)(63 - result);
     }
     return 64;
 #elif defined(_MSC_VER) && !defined(__clang__)
     // MSVC does not have __buitin_clzll. Compose two calls to _BitScanReverse
     unsigned long result = 0;  // NOLINT(runtime/int)
     if ((n >> 32) && _BitScanReverse(&result, (unsigned long)(n >> 32))) {
-        return 31 - result;
+        return  (uint32_t)(31 - result);
     }
     if (_BitScanReverse(&result, (unsigned long)n)) {
-        return 63 - result;
+        return (uint32_t)(63 - result);
     }
     return 64;
 #elif defined(__GNUC__) || defined(__clang__)
@@ -309,7 +309,7 @@ PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountLeadingZeros64(uint64_t n) {
     if (n == 0) {
         return 64;
     }
-    return __builtin_clzll(n);
+    return  (uint32_t)__builtin_clzll(n);
 #else
     return CountLeadingZeros64Slow(n);
 #endif
diff --git a/parallel_hashmap/phmap_dump.h b/parallel_hashmap/phmap_dump.h
index 8739389..4dac176 100644
--- a/parallel_hashmap/phmap_dump.h
+++ b/parallel_hashmap/phmap_dump.h
@@ -169,8 +169,12 @@ public:
         ofs_.open(file_path, std::ofstream::out | std::ofstream::trunc | std::ofstream::binary);
     }
 
+    ~BinaryOutputArchive() = default;
+    BinaryOutputArchive(const BinaryOutputArchive&) = delete;
+    BinaryOutputArchive& operator=(const BinaryOutputArchive&) = delete;
+
     bool saveBinary(const void *p, size_t sz) {
-        ofs_.write(reinterpret_cast<const char*>(p), sz);
+        ofs_.write(reinterpret_cast<const char*>(p), (std::streamsize)sz);
         return true;
     }
 
@@ -197,9 +201,13 @@ public:
     BinaryInputArchive(const char * file_path) {
         ifs_.open(file_path, std::ofstream::in | std::ofstream::binary);
     }
+    
+    ~BinaryInputArchive() = default;
+    BinaryInputArchive(const BinaryInputArchive&) = delete;
+    BinaryInputArchive& operator=(const BinaryInputArchive&) = delete;
 
     bool loadBinary(void* p, size_t sz) {
-        ifs_.read(reinterpret_cast<char*>(p), sz);
+        ifs_.read(reinterpret_cast<char*>(p),  (std::streamsize)sz);
         return true;
     }