1 files changed, 22 insertions, 4 deletions
diff --git a/deimos/core/std.h b/deimos/core/std.h
index c789d95..89d7da5 100644
--- a/deimos/core/std.h
+++ b/deimos/core/std.h
@@ -5,10 +5,10 @@ using uint16_t  = unsigned short;
 using uint32_t  = unsigned int;
 using uint64_t  = unsigned long long;
 
-using int8_t    = char;
-using int16_t   = short;
-using int32_t   = int;
-using int64_t   = long long;
+using int8_t    = signed char;
+using int16_t   = signed short;
+using int32_t   = signed int;
+using int64_t   = signed long long;
 
 using size_t    = uint64_t;
 
@@ -17,6 +17,10 @@ static_assert(sizeof(size_t) == sizeof(void*), "size_t should be pointer size");
 namespace std
 {
 
+template<typename T> concept integral = __is_integral(T);
+template<typename T> concept signed_integral = integral<T> && __is_signed(T);
+template<typename T> concept unsigned_integral = integral<T> && __is_unsigned(T);
+
 template<typename T> constexpr bool is_trivially_destructible_v = __is_trivially_destructible(T);
 
 template<typename U, typename V> constexpr bool _is_same_helper = false;
@@ -74,6 +78,20 @@ constexpr T exchange(T& obj, U&& new_value)
 enum __attribute__((__may_alias__)) byte : uint8_t {};
 static_assert(sizeof(byte) == 1, "");
 
+template<typename T>
+class initializer_list
+{
+    const T*    m_begin = nullptr;
+    size_t      m_size  = 0;
+
+public:
+    constexpr initializer_list() noexcept = default;
+
+    constexpr size_t size() const noexcept { return m_size; }
+    constexpr const T* begin() const noexcept { return m_begin; }
+    constexpr const T* end() const noexcept { return m_begin + m_size; }
+};
+
 } // namespace std
 
 static_assert(std::same_as<int, int>, "");