start ...

.gitignore

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+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+*~
+*.autosave
+*.a
+*.core
+*.moc
+*.o
+*.obj
+*.orig
+*.rej
+*.so
+*.so.*
+*_pch.h.cpp
+*_resource.rc
+*.qm
+.#*
+*.*#
+core
+!core/
+tags
+.DS_Store
+.directory
+*.debug
+Makefile*
+*.prl
+*.app
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+Thumbs.db
+*.res
+*.rc
+/.qmake.cache
+/.qmake.stash
+
+# qtcreator generated files
+*.pro.user*
+CMakeLists.txt.user*
+
+# xemacs temporary files
+*.flc
+
+# Vim temporary files
+.*.swp
+
+# Visual Studio generated files
+*.ib_pdb_index
+*.idb
+*.ilk
+*.pdb
+*.sln
+*.suo
+*.vcproj
+*vcproj.*.*.user
+*.ncb
+*.sdf
+*.opensdf
+*.vcxproj
+*vcxproj.*
+
+# MinGW generated files
+*.Debug
+*.Release
+
+# Python byte code
+*.pyc
+
+# Binaries
+# --------
+*.dll
+*.exe
+
+build/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10.0)
+project(snipplib VERSION 0.1.0 LANGUAGES CXX)
+
+option(BUILD_EXAMPLES "Build examples" ON)
+
+
+set(LIB_HEADERS include/snipplib/concepts/snplib_concepts.h 
+                include/snipplib/utils/snplib_hash.h 
+                include/snipplib/utils/snplib_utils.h
+                include/snipplib/hmap/snplib_hmap.h)
+
+add_library(${PROJECT_NAME} INTERFACE ${LIB_HEADERS})
+target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_23)
+target_include_directories(
+    ${PROJECT_NAME}
+    INTERFACE
+        "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
+        "$<INSTALL_INTERFACE:include/${PROJECT_NAME}>"
+)
+
+
+set(EXAM_STRING str_exam)
+add_executable(${EXAM_STRING} examples/str_exam.cpp)
+target_link_libraries(${EXAM_STRING} ${PROJECT_NAME})

examples/str_exam.cpp

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+#include <print>
+// #include "../utils/snplib_string.h"
+// #include "../include/snipplib/snplib_string.h"
+#include <snipplib/utils/snplib_string.h>
+
+using namespace snplib;
+int main()
+{
+    std::string si = "   dewf wek e    lwekjflkj  ";
+
+    auto s = snplib_trim_spaces(si);
+
+    std::println("s = '{}'", s);
+
+    auto sv = snplib_trim_spaces_as_view(si, TrimType::TRIM_LEFT);
+
+    std::println("sv(TrimType::TRIM_LEFT) = '{}'", sv);
+
+    sv = snplib_trim_spaces_as_view(si, TrimType::TRIM_RIGHT);
+
+    std::println("sv(TrimType::TRIM_RIGHT) = '{}'", sv);
+
+    sv = snplib_trim_spaces_as_view(si, TrimType::TRIM_BOTH);
+
+    std::println("sv(TrimType::TRIM_BOTH) = '{}'", sv);
+
+    
+    return 0;
+}

include/snipplib/concepts/snplib_concepts.h

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+#pragma once
+
+#include <concepts>
+#include <ranges>
+
+namespace snplib {
+
+// type T is hashable
+template <typename T>
+concept snplib_hashable_c = requires(T t) {
+    { std::hash<T>(t) } -> std::convertible_to<size_t>;
+};
+
+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>;
+
+template <typename T, typename CharT = char>
+concept snplib_input_char_range_c = std::ranges::input_range<T> && std::same_as<std::ranges::range_value_t<T>, CharT>;
+
+template <typename T, typename CharT = char>
+concept snplib_output_char_range_c = std::ranges::output_range<T, CharT>;
+
+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>;
+
+
+
+} // end of snplib namespace

include/snipplib/hmap/snplib_hmap.h

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+#pragma once
+
+#include "../concepts/snplib_concepts.h"
+#include "../utils/snplib_hash.h"
+
+namespace snplib {
+
+
+template<snplib_hashable_c KeyT>
+class HeterogenMap {
+protected:
+    // actuall map key type
+    typedef std::pair<const HeterogenMap*, KeyT> key_t;
+
+    struct KeyHash {
+        static size_t operator()(key_t key) {
+            size_t hash = 0;
+            
+            snplib_hash_combine(hash, key.first, , key.second);
+
+            return hash;
+        }
+    }
+
+    template <typename VT>
+    inline static std::unordered_map<key_t, VT, KeyHash> _umap{};
+
+    std::vector<std::function<void()>> _clearFunc{};
+    
+public:
+    enum Error : {ERROR_OK, ERROR_NO_ELEM};
+
+    HeterogenMap() = default;
+
+    ~HeterogenMap() {
+        for (auto &func: _clearFunc) {
+            func();
+        }
+    }
+
+    template<typename VT>
+    size_t push(KeyT const& key, VT&& value) {
+        auto it = _umap<std::decay_t<VT>>.emplace(std::make_pair(this, key), std::forward<VT>(value));
+
+        if (it.second){
+            _clearFunc.empace_back([it=it.first]() { _umap<std::decay_t<VT>>.erase(it); });
+        } // here the element already exists (just update its value)
+
+        return _clearFunc.size();
+    }
+
+    template<typename VT, typename ...CtorArgTs>
+    size_t emplace(KeyT const&, CtorArgTs&& ...args) {
+        return push(key, VT(std::forward<CtorArgTs>(args)...));
+    }
+
+    template<typename VT>
+    std::expected<VT, Error> get(KeyT const& key) const {
+        if (auto it = _umap<VT>.find(std::make_pair(this, key)); it != _umap<VT>.end()) {
+            return it->second;
+        }
+
+        return std::unexpected(Error::ERROR_NO_ELEM);
+    }
+};
+
+} // end of namespace snplib

include/snipplib/utils/snplib_hash.h

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+#pragma once
+
+#include "../concepts/snplib_concepts.h"
+#include <iterator>
+
+namespace snplib {
+
+template <snplib_input_char_range_c R>
+static constexpr size_t FNV1aHash(const R& r)
+{
+    static_assert(sizeof(size_t) == 8 || sizeof(size_t) == 4, "ONLY FOR 32 or 64-bit size_t!!!");
+
+    size_t hash = 0, prime = 0;
+    if constexpr (sizeof(size_t) == 8) {  // 64-bit
+        prime = 1099511628211UL;
+        hash = 14695981039346656037UL;
+    } else if constexpr (sizeof(size_t) == 4) {  // 32-bit
+        prime = 16777619;
+        hash = 2166136261;
+    }
+
+    for (const char& ch : r) {
+        hash ^= ch;
+        hash *= prime;
+    }
+
+    return hash;
+}
+
+static constexpr size_t FNV1aHash(std::forward_iterator auto begin, std::sentinel_for<decltype(begin)> auto end)
+    requires std::same_as<std::remove_cv_t<std::iter_value_t<decltype(begin)>>, char>
+{
+    static_assert(sizeof(size_t) == 8 || sizeof(size_t) == 4, "ONLY FOR 32 or 64-bit size_t!!!");
+
+    size_t hash = 0, prime = 0;
+    if constexpr (sizeof(size_t) == 8) {  // 64-bit
+        prime = 1099511628211UL;
+        hash = 14695981039346656037UL;
+    } else if constexpr (sizeof(size_t) == 4) {  // 32-bit
+        prime = 16777619;
+        hash = 2166136261;
+    }
+
+    for (auto it = begin; it != end; ++it) {
+        hash ^= *it;
+        hash *= prime;
+    }
+
+    return hash;
+}
+
+
+// Boost implementation of hash combining
+template <snplib_hashable_c T, snplib_hashable_c ...Ts>
+static constexpr void snplib_hash_combine(std::size_t& seed, const T& v, Ts&& ... vs) {
+    static constexpr auto digits = std::numeric_limits<std::size_t>::digits;
+    static_assert(digits == 64 || digits == 32, "Unsupported 'size_t' type size!");
+    
+    if constexpr (digits == 64) {
+        std::size_t x = seed + 0x9e3779b9 + std::hash<T>()(v);
+        const std::size_t m = 0xe9846af9b1a615d;
+        x ^= x >> 32;
+        x *= m;
+        x ^= x >> 32;
+        x *= m;
+        x ^= x >> 28;
+        seed = x;
+    }
+    else { // 32-bits
+        std::size_t x = seed + 0x9e3779b9 + std::hash<T>()(v);
+        const std::size_t m1 = 0x21f0aaad;
+        const std::size_t m2 = 0x735a2d97;
+        x ^= x >> 16;
+        x *= m1;
+        x ^= x >> 15;
+        x *= m2;
+        x ^= x >> 15;
+        seed = x;
+    }
+
+    if constexpr (sizeof...(Ts)) {
+        snplib_hash_combine(seed, std::forward<Ts>(vs)...);
+    }
+}
+
+} // end of snplib namespace

include/snipplib/utils/snplib_string.h

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+#pragma once
+
+#include <algorithm>
+#include <string>
+
+#include "../concepts/snplib_concepts.h"
+
+namespace snplib {
+
+constexpr static bool snplib_is_space(char in) noexcept
+{
+    static constexpr auto ws = {' ', '\t', '\n', '\v', '\r', '\f'};
+    return std::ranges::any_of(ws, [in](auto p) { return p == in; });
+};
+
+
+enum class TrimType { TRIM_LEFT, TRIM_RIGHT, TRIM_BOTH };
+
+template <snplib_output_char_range_c OR, snplib_input_char_range_c R, typename IsSpaceFuncT = decltype(snplib_is_space)>
+constexpr static OR snplib_trim_spaces(R&& r, TrimType type = TrimType::TRIM_BOTH, IsSpaceFuncT&& is_space_func = snplib_is_space)
+{
+    if (type == TrimType::TRIM_LEFT) {
+        auto res = r | std::views::drop_while(is_space_func);
+        return OR{res.begin(), res.end()};
+    } else if (type == TrimType::TRIM_RIGHT) {
+        auto res =  r | std::views::reverse | std::views::drop_while(is_space_func) |
+            std::views::reverse;
+        return OR{res.begin(), res.end()};
+    } else if (type == TrimType::TRIM_BOTH) {
+        auto res =  r | std::views::drop_while(is_space_func) | std::views::reverse | std::views::drop_while(is_space_func) |
+            std::views::reverse;
+        return OR{res.begin(), res.end()};
+    } 
+    
+    return OR{};    
+}
+
+template <snplib_input_char_range_c R, typename IsSpaceFuncT = decltype(snplib_is_space)>
+constexpr static std::string snplib_trim_spaces(R&& r, TrimType type = TrimType::TRIM_BOTH, IsSpaceFuncT&& is_space_func = snplib_is_space)
+{
+    return snplib_trim_spaces<std::string>(std::forward<R>(r), type, std::forward<IsSpaceFuncT>(is_space_func));
+}
+
+template <snplib_input_char_range_c R, typename IsSpaceFuncT = decltype(snplib_is_space)>
+constexpr static std::string_view snplib_trim_spaces_as_view(R&& r, TrimType type = TrimType::TRIM_BOTH, IsSpaceFuncT&& is_space_func = snplib_is_space)
+    requires std::ranges::contiguous_range<R>
+{
+    auto end = std::forward<R>(r).end();
+
+    auto f1 = std::forward<R>(r).begin();
+
+    if (type != TrimType::TRIM_RIGHT) {
+        // look for the first non-space symbol
+        f1 = std::ranges::find_if_not(std::forward<R>(r), std::forward<IsSpaceFuncT>(is_space_func));
+        if (f1 == end) {  // all are spaces!
+            return std::string_view();
+        }
+    }
+
+    auto f2 = end;
+
+    if (type != TrimType::TRIM_LEFT) {
+        auto f3 = f1;
+
+        do {
+            f2 = std::ranges::find_if(++f3, end, std::forward<IsSpaceFuncT>(is_space_func));
+            if (f2 == end)
+                break;
+            f3 = std::ranges::find_if_not(f2 + 1, end, std::forward<IsSpaceFuncT>(is_space_func));
+        } while (f3 != end);
+    }
+
+    return std::string_view(f1, f2);
+}
+
+
+} // end of snplib namespace

include/snipplib/utils/snplib_utils.h

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+#pragma once
+

snipplib.cpp

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+#include <iostream>
+
+void say_hello(){
+    std::cout << "Hello, from snipplib!\n";
+}