C++ template utilities

Header-only C++20 utility library covering generic containers, compile-time programming, hashing, math, and low-level helpers. Add the repository root to the include path; no library target needs to be linked.

Facilities

Compiler and language helpers

Header	Facility
compiler/compiler_warnings_control.h	Portable macros for saving/restoring diagnostic state, suppressing all or selected MSVC/Clang/GCC warnings, and marking variables unused.
lang/utils.hpp	Short move alias plus macros that declare a type non-copyable or fully non-movable.
utility/macro_utils.h	Expansion-aware token concatenation and stringification macros.
utility/template_magic.hpp	Intentional compile-failure macros, an sfinae alias, compile-time type printer, and overload-set builder for visitors.

Containers and algorithms

Header	Facility
container/algorithms.hpp	Remove/erase-style ContainerAlgorithms::erase_if() for sequence containers.
container/flat_map.hpp	Vector-backed sorted flat_map and flat_set with heterogeneous lookup, random-access iteration, ordinary insert/erase, sorted-range merge, and efficient unsorted batch append/finalize. flat_map stores keys and values in separate vectors and exposes pair-like proxy references.
container/iterator_helpers.hpp	Const forward-iterator wrapper that retains its parent container and can report validity or end reached, plus cbegin/cend factories.
container/multi_index.hpp, container/multimap_helpers.hpp	MultiIndexSet, owning values uniquely by a primary member and indexing them non-uniquely by a secondary member, with primary, exact-secondary, and secondary-range lookup; includes mapped-value iterator adaptation.
container/ordered_containers.hpp	Adapter for explicitly sorted sequence containers, adding lower-bound find, unique sorted insertion, and sorting.
container/set_operations.hpp	Longest common prefix, stable/configurable deduplication, unordered set difference, three-way diff, and order-insensitive equality across compatible containers (sorting non-set inputs in place).
container/std_container_helpers.hpp	Begin/end pair macros, transparent std::set alias, and helpers that select push_back versus insert and member find versus std::find.
container/tracking_allocator.hpp	Standard allocator wrapper that reports bytes currently allocated through that allocator instance.
container/vector2d.hpp	Rectangular vector<vector<T>> convenience type with two-dimensional resize, row fill, width, and height.

Compile-time and type utilities

Header	Facility
parameter_pack/parameter_pack_helpers.hpp	Pack type/value lookup, occurrence tests/counts, value/type iteration, and a type_pack supporting indexing, append, tuple conversion, and template construction.
tuple/tuple_helpers.hpp	cv/ref-tolerant tuple size, type index lookup, compile-time size, and value-preserving for_each.
utility/constexpr_algorithms.hpp	consteval and fold-based compile-time loops plus bounded dispatch from a runtime value to a non-type template argument.
utility/extra_type_traits.hpp	Traits for trivial byte serialization, cv/ref removal, template specialization detection, member-pointer value type, equality comparability, and sortable containers.
utility/optional_consteval.hpp	Small optional-like value restricted to constant evaluation.

Hashing, math, and random numbers

Header	Facility
hash/hash_consteval.hpp	Seedable compile-time MurmurHash3 x86-32 for string views.
hash/mixers.h	mix_moremur(), a fast 64-bit integer finalizer/mixer.
hash/wheathash.hpp	Seeded or fixed-seed 32/64-bit wheathash for byte ranges and whole object representations.
math/math.hpp	Typed rounding/floor/ceil, safe integral and floating absolute value, clamp/sign/square/range helpers, arithmetic/geometric means, powers of two, range reduction, and precomputed fast 32-bit modulo.
random/randomnumbergenerator.h	Deterministically seeded generator-plus-distribution wrapper, thread-local static ranged RNG facade, and printable-character specialization.

Strings and regular expressions

Header	Facility
regex/regex_helpers.hpp	Callback-driven regex replacement and replacement of a selected capture within one match.
string/string_helpers.hpp	Single-character string comparison and stream-like/numeric append operators for standard strings.

Storage, representation, and lifetime

Header	Facility
utility/aligned_wrapper.hpp	Explicitly aligned value wrapper and platform-sized CacheLinePadded alias.
utility/callback_caller.hpp	Non-owning multi-subscriber registry that invokes an interface method for every subscriber without prematurely moving by-value arguments.
utility/integer_literals.hpp	_u64, _i64, _u16, _i16, and _z fixed-type integer literals.
utility/memory_cast.hpp	Checked byte-copy conversion between trivially serializable representations and whole-object zeroing.
utility/named_type_wrapper.hpp	Lightweight strong-ish named wrapper for trivial values, with macros for call-site-unique named types.
utility/odd_sized_integer.hpp	Comparable unsigned integer stored in any byte width from 1 through 8.
utility/on_scope_exit.hpp	EXEC_ON_SCOPE_EXIT, an RAII scope-exit callback with an automatically unique local name.
utility/static_data_buffer.hpp	Fixed-capacity byte buffer with logical size, cursor, seek, bounded read/write, direct data access, and range iteration.