Fix some miscelenious issues encountered while working on #335

CMakeLists.txt

@@ -13,6 +13,11 @@ if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
  set(USEARCH_IS_MAIN_PROJECT ON)
 endif ()
 
+# Allow CMake 3.13+ to override options when using FetchContent / add_subdirectory
+if (POLICY CMP0077)
+ cmake_policy(SET CMP0077 NEW)
+endif ()
+
 # Options
 option(USEARCH_INSTALL "Install CMake targets" OFF)
 
@@ -31,11 +36,6 @@ option(USEARCH_BUILD_WOLFRAM "Compile Wolfram Language bindings" OFF)
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
 include(ExternalProject)
 
-# Allow CMake 3.13+ to override options when using FetchContent / add_subdirectory
-if (POLICY CMP0077)
- cmake_policy(SET CMP0077 NEW)
-endif ()
-
 # Configuration
 include(GNUInstallDirs)
 set(USEARCH_TARGET_NAME ${PROJECT_NAME})

cpp/test.cpp

@@ -209,7 +209,14 @@ void test_cosine(std::size_t collection_size, std::size_t dimensions) {
  metric_punned_t metric(dimensions, metric_kind_t::cos_k, scalar_kind<scalar_at>());
  index_dense_config_t config(connectivity);
  config.multi = multi;
- index_t index = index_t::make(metric, config);
+ index_t index;
+ {
+ index_t index_tmp1 = index_t::make(metric, config);
+ // move construction
+ index_t index_tmp2 = std::move(index_tmp1);
+ // move assignment
+ index = std::move(index_tmp2);
+ }
  test_cosine<true>(index, matrix);
  }
  }
@@ -313,4 +320,4 @@ int main(int, char**) {
  test_tanimoto<std::int64_t, std::uint32_t>(dimensions, connectivity);
 
  return 0;
-}
+}

include/usearch/index.hpp

@@ -1362,7 +1362,7 @@ class output_file_t {
  serialization_result_t write(void const* begin, std::size_t length) noexcept {
  serialization_result_t result;
  std::size_t written = std::fwrite(begin, length, 1, file_);
- if (!written)
+ if (length && !written)
  return result.failed(std::strerror(errno));
  return result;
  }
@@ -1404,7 +1404,7 @@ class input_file_t {
  serialization_result_t read(void* begin, std::size_t length) noexcept {
  serialization_result_t result;
  std::size_t read = std::fread(begin, length, 1, file_);
- if (!read)
+ if (length && !read)
  return result.failed(std::feof(file_) ? "End of file reached!" : std::strerror(errno));
  return result;
  }

include/usearch/index_plugins.hpp

@@ -1819,7 +1819,8 @@ class flat_hash_multi_set_gt {
  }
 
  // Reset populated slots count
- std::memset(data_, 0, buckets_ * bytes_per_bucket());
+ if (data_)
+ std::memset(data_, 0, buckets_ * bytes_per_bucket());
  populated_slots_ = 0;
  }