Fix compiler warnings

- _CRT_SECURE_NO_WARNINGS suppresses warnings for "unsafe" fopen, strcpy etc.
- int -> size_t

CMakeLists.txt

@@ -46,7 +46,9 @@ set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})
 
 IF (WIN32)
     set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
-ENDIF()
+    add_compile_definitions(_CRT_SECURE_NO_WARNINGS) # suppress warnings for fopen, strcpy, etc.
+endif()
+
 
 IF (BUILD_ACM)
     message(STATUS "BUILD_ACM")
@@ -370,7 +372,12 @@ endif()
 set(liblinkahead_INCLUDE_DEST "include/linkahead")
 set(liblinkahead_LIB_DEST "lib")
 
-set(CMAKE_INSTALL_PREFIX "$ENV{HOME}/.local/")
+if (WIN32)
+    set(CMAKE_INSTALL_PREFIX "$ENV{LOCALAPPDATA}/linkahead")
+else()
+    set(CMAKE_INSTALL_PREFIX "$ENV{HOME}/.local/")
+endif()
+
 install(
     # targets to install
     TARGETS linkahead clinkahead caosdb_grpc

include/linkahead/result_set.h

@@ -40,7 +40,7 @@ class ResultSet {
 
 public:
   virtual ~ResultSet() = default;
-  [[nodiscard]] virtual auto size() const noexcept -> int = 0;
+  [[nodiscard]] virtual auto size() const noexcept -> size_t = 0;
   [[nodiscard]] virtual auto at(const int index) const -> const Entity & = 0;
   [[nodiscard]] virtual auto mutable_at(int index) const -> Entity * = 0;
   /**
@@ -91,7 +91,7 @@ public:
   virtual ~AbstractMultiResultSet() = default;
   inline explicit AbstractMultiResultSet(std::vector<std::unique_ptr<Entity>> result_set)
     : items(std::move(result_set)) {}
-  [[nodiscard]] inline auto size() const noexcept -> int override { return this->items.size(); }
+  [[nodiscard]] inline auto size() const noexcept -> size_t override { return this->items.size(); }
   [[nodiscard]] inline auto at(const int index) const -> const Entity & override {
     return *(this->items.at(index));
   }