add null check

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.20)
 include(cmake/color.cmake)
 
-set(BLT_VERSION 0.17.19)
+set(BLT_VERSION 0.17.20)
 set(BLT_TEST_VERSION 0.0.1)
 
 set(BLT_TARGET BLT)

include/blt/std/memory.h

@@ -468,6 +468,8 @@ namespace blt
                 size = std::max(size_, size);
                 size = blt::mem::next_byte_allocation(size);
                 T* new_buffer = new T[size];
+                if (buffer_ != nullptr)
+                {
                     if constexpr (std::is_trivially_copyable_v<T>)
                     {
                         std::memcpy(new_buffer, buffer_, size_ * sizeof(T));
@@ -482,6 +484,7 @@ namespace blt
                                 new_buffer[i] = std::move(buffer_[i]);
                     }
                     delete[] buffer_;
+                }
                 buffer_ = new_buffer;
                 size_ = size;
             }

libraries/parallel-hashmap

@@ -1 +1 @@
-Subproject commit d88c5e15079047777b418132ece5879e7c9aaa2b
+Subproject commit 10368163ab1f4367d2f0685b5928b1c973ebd1ec