From a95a3a5d1b522c1d651fba789fba78c4d32ebf86 Mon Sep 17 00:00:00 2001
From: "Timur A. Fatkhullin" <amirych@gmail.com>
Date: Thu, 18 Jun 2026 00:31:08 +0300
Subject: [PATCH] ...

---
 examples/hmap_example.cpp                   | 19 ++++++++++
 include/snipplib/concepts/snplib_concepts.h | 31 ++++++++++++++++
 include/snipplib/containers/snplib_hmap.h   | 34 +++++++++++++++--
 include/snipplib/containers/snplib_hvec.h   | 41 +++++++++++++++++++++
 4 files changed, 122 insertions(+), 3 deletions(-)
 create mode 100644 include/snipplib/containers/snplib_hvec.h

diff --git a/examples/hmap_example.cpp b/examples/hmap_example.cpp
index 293ae49..4906bc2 100644
--- a/examples/hmap_example.cpp
+++ b/examples/hmap_example.cpp
@@ -96,5 +96,24 @@ int main()
         }
     }
 
+    std::println("\n{:*^80}", " delete key ");
+
+    std::println("erase node with key 'int_key'");
+    if (hmap_move.erase("int_key")) {
+        auto ri = hmap_move.get<int>("int_key");
+        if (ri) {  // should not be
+            std::println("hmap_move['int_key'] = {}", ri.value());
+        } else {
+            std::println("cannot get value of hmap_move['int_key']");
+        }
+
+        ri = hmap_copy.get<int>("int_key");
+        if (ri) {
+            std::println("hmap_copy['int_key'] = {}", ri.value());
+        } else {
+            std::println("cannot get value of hmap_copy['int_key']");
+        }
+    }
+
     return 0;
 }
\ No newline at end of file
diff --git a/include/snipplib/concepts/snplib_concepts.h b/include/snipplib/concepts/snplib_concepts.h
index e66af12..2f477c0 100644
--- a/include/snipplib/concepts/snplib_concepts.h
+++ b/include/snipplib/concepts/snplib_concepts.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <chrono>
 #include <concepts>
 #include <ranges>
 
@@ -12,6 +13,7 @@ concept snplib_hashable_c = requires(T t) {
     { std::hash<T>{}(t) } -> std::convertible_to<size_t>;
 };
 
+// some concepts for various types of char sequence
 template <typename T, typename CharT = char>
 concept snplib_char_range_c = std::ranges::range<T> && std::same_as<std::ranges::range_value_t<T>, CharT>;
 
@@ -25,5 +27,34 @@ template <typename T, typename CharT = char>
 concept snplib_char_view_c = std::ranges::view<T> && std::same_as<std::ranges::range_value_t<T>, CharT>;
 
 
+// std::chrono related concepts
+
+template <typename T>
+concept snplib_time_duration_c = requires(T t) {
+    []<typename R, typename P>(std::type_identity<std::chrono::duration<R, P>>) {
+
+    }(std::type_identity<std::remove_cvref_t<T>>());
+};
+
+template <typename T, typename ClockT>
+concept snplib_time_point_c = requires(T t) {
+    []<typename DurT>(std::type_identity<std::chrono::time_point<ClockT, DurT>>) {
+
+    }(std::type_identity<std::remove_cvref_t<T>>());
+};
+
+template <typename T>
+concept snplib_systime_point_c = snplib_time_point_c<T, std::chrono::system_clock>;
+
+
+template <typename T>
+concept snplib_utctime_point_c = snplib_time_point_c<T, std::chrono::utc_clock>;
+
+
+// callables (does not working for templated functions/methods and generic lambdas!)
+
+template <typename T>
+concept snplib_callable_c = std::is_function_v<T> || (std::is_object_v<T> && requires(T) { &T::operator(); });
+
 
 }  // namespace snplib
\ No newline at end of file
diff --git a/include/snipplib/containers/snplib_hmap.h b/include/snipplib/containers/snplib_hmap.h
index 99c30da..46588ea 100644
--- a/include/snipplib/containers/snplib_hmap.h
+++ b/include/snipplib/containers/snplib_hmap.h
@@ -36,6 +36,7 @@ protected:
     inline static std::vector<std::function<void(const HeterogenMap*, HeterogenMap*)>> _copyFunc{};
 
     inline static std::vector<std::function<void(HeterogenMap*)>> _clearFunc{};
+    inline static std::vector<std::function<bool(KeyT const&, const HeterogenMap*)>> _eraseFunc{};
     inline static std::vector<std::function<bool(KeyT const&, const HeterogenMap*)>> _containsFunc{};
 
 public:
@@ -43,7 +44,7 @@ public:
 
     HeterogenMap() = default;
 
-    ~HeterogenMap()
+    virtual ~HeterogenMap()
     {
         clear();
     }
@@ -154,6 +155,16 @@ public:
                 _getter<v_t>[obj].clear();
                 _setter<v_t>[obj].clear();
             });
+
+            _eraseFunc.emplace_back([](KeyT const& k, const HeterogenMap* obj) {
+                bool do_delete = _values<v_t>[obj].erase(k) != 0;
+                if (do_delete) {
+                    _getter<v_t>[obj].erase(k);
+                    _setter<v_t>[obj].erase(k);
+                }
+
+                return do_delete;
+            });
         }
 
         _values<v_t>[this].emplace(key, std::forward<VT>(value));
@@ -164,7 +175,6 @@ public:
         _getter<v_t>[this].emplace(key, [key](const HeterogenMap* obj) { return _values<v_t>[obj][key]; });
         _setter<v_t>[this].emplace(key, [key](const v_t& v, const HeterogenMap* obj) { _values<v_t>[obj][key] = v; });
 
-
         return true;
     }
 
@@ -198,6 +208,13 @@ public:
                     _getter<u_t>[obj].clear();
                     _setter<u_t>[obj].clear();
                 });
+
+                _eraseFunc.emplace_back([](KeyT const& k, const HeterogenMap* obj) {
+                    _getter<u_t>[obj].erase(k);
+                    _setter<u_t>[obj].erase(k);
+
+                    return true;
+                });
             }
         };
 
@@ -209,11 +226,22 @@ public:
     }
 
     template <typename VT, typename... CtorArgTs>
-    size_t emplace(KeyT const& key, CtorArgTs&&... args)
+    bool emplace(KeyT const& key, CtorArgTs&&... args)
     {
         return push(key, VT(std::forward<CtorArgTs>(args)...));
     }
 
+
+    bool erase(KeyT const& key)
+    {
+        bool ok = false;
+        for (auto& func : _eraseFunc) {
+            ok |= func(key, this);
+        }
+
+        return ok;
+    }
+
     template <typename UT>
     std::expected<UT, Error> get(KeyT const& key) const
     {
diff --git a/include/snipplib/containers/snplib_hvec.h b/include/snipplib/containers/snplib_hvec.h
new file mode 100644
index 0000000..b134c28
--- /dev/null
+++ b/include/snipplib/containers/snplib_hvec.h
@@ -0,0 +1,41 @@
+#pragma once
+
+
+#include <functional>
+#include <unordered_map>
+
+
+namespace snplib
+{
+
+class HeterogenVec
+{
+protected:
+    template <typename VT>
+    inline static std::unordered_map<const HeterogenVec*, std::vector<VT>> _values{};
+
+    inline static std::vector<std::function<void(const HeterogenVec*)>> _clearFunc{};
+
+public:
+    void clear()
+    {
+        for (auto& func : _clearFunc) {
+            func(this);
+        }
+    }
+
+
+    template <typename VT>
+    void insert(VT&& value)
+    {
+        using v_t = std::decay_t<VT>;
+
+        if (_values<v_t>.empty()) {
+            _clearFunc.emplace_back([](const HeterogenVec* obj) { _values<v_t>[obj].clear(); });
+        }
+
+        _values<v_t>[this].push_back(std::forward<VT>(value));
+    }
+};
+
+}  // end of namespace snplib
\ No newline at end of file