diff --git a/CMakeLists.txt b/CMakeLists.txt
index ce3b3928..6eb4423d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,9 +7,6 @@
 #
 # Lightweight header-only C++20 enum reflection
 #
-#   Parts based on magic_enum <https://github.com/Neargye/magic_enum>
-#   Copyright (c) 2019 - 2024 Daniil Goncharov <neargye@gmail.com>.
-#
 # Licensed under the MIT License <http://opensource.org/licenses/MIT>.
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -37,10 +34,16 @@ project (conjure_enum
    VERSION 1.0.0
 )
 
+# to disable warnings:
+# cmake -DBUILD_ALL_WARNINGS=false ..
+option(BUILD_ALL_WARNINGS "enable building with all warnings" true)
+message("-- Build with all warnings : ${BUILD_ALL_WARNINGS}")
+
 # to disable building unit tests:
 # cmake -DBUILD_UNITTESTS=false ..
 option(BUILD_UNITTESTS "enable building unit tests" true)
 message("-- Build unit tests: ${BUILD_UNITTESTS}")
+
 if(BUILD_UNITTESTS)
 	include(FetchContent)
 	FetchContent_Declare(Catch2
@@ -62,6 +65,11 @@ foreach(x IN LISTS files)
 	add_executable(${target} examples/${x})
 	set_target_properties(${target} PROPERTIES CXX_STANDARD 20 CXX_STANDARD_REQUIRED true)
 	target_include_directories(${target} PRIVATE include examples)
+	if(BUILD_ALL_WARNINGS)
+		target_compile_options(${target} PRIVATE
+			$<$<CXX_COMPILER_ID:MSVC>:/W4>
+			$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wall -Wextra -Wpedantic>)
+	endif()
 	if(BUILD_UNITTESTS)
 		target_link_libraries(${target} PRIVATE Catch2::Catch2WithMain)
 	endif()
diff --git a/examples/example.cpp b/examples/example.cpp
index 1f537998..1c190b8b 100644
--- a/examples/example.cpp
+++ b/examples/example.cpp
@@ -7,9 +7,6 @@
 //
 // Lightweight header-only C++20 enum reflection
 //
-//   Parts based on magic_enum <https://github.com/Neargye/magic_enum>
-//   Copyright (c) 2019 - 2024 Daniil Goncharov <neargye@gmail.com>.
-//
 // Licensed under the MIT License <http://opensource.org/licenses/MIT>.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -71,7 +68,7 @@ const std::string demangle() noexcept
 	return typeid(T).name();
 }
 
-int main(int argc, char *argv[])
+int main(void)
 {
 	int total{};
 	auto myfunc { conjure_enum<component>::for_each([](component val, int other, int& tot)
@@ -197,7 +194,7 @@ int main(int argc, char *argv[])
 	const foo bar;
 	ek.for_each(std::bind(&foo::printer, &bar, std::placeholders::_1, 10));
 	ek.for_each(&foo::printer, &bar, 10);
-	enum_bitset<numbers&> er("one|three|four|eight"sv, true);
+	//enum_bitset<numbers&> er("one|three|four|eight"sv, true);
 
 	for (const auto pp : iterator_adaptor<numbers>())
 		std::cout << static_cast<int>(std::get<0>(pp)) << '\n';
diff --git a/examples/unittests.cpp b/examples/unittests.cpp
index 54124752..027a40a1 100644
--- a/examples/unittests.cpp
+++ b/examples/unittests.cpp
@@ -7,9 +7,6 @@
 //
 // Lightweight header-only C++20 enum reflection
 //
-//   Parts based on magic_enum <https://github.com/Neargye/magic_enum>
-//   Copyright (c) 2019 - 2024 Daniil Goncharov <neargye@gmail.com>.
-//
 // Licensed under the MIT License <http://opensource.org/licenses/MIT>.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -263,7 +260,7 @@ TEST_CASE("for_each")
 TEST_CASE("enum_bitset")
 {
 	enum_bitset<numbers> eb;
-	enum_bitset<numbers&> ebr;
+	//enum_bitset<numbers&> ebr;
 	eb.set_all<numbers::zero,numbers::two,numbers::five,numbers::nine>();
 	REQUIRE(eb.test_all<numbers::zero,numbers::two,numbers::five,numbers::nine>());
 	eb.reset<numbers::FIVE>(); // use alias
diff --git a/include/fix8/conjure_enum.hpp b/include/fix8/conjure_enum.hpp
index 531a6106..ab01bc06 100644
--- a/include/fix8/conjure_enum.hpp
+++ b/include/fix8/conjure_enum.hpp
@@ -304,8 +304,8 @@ class conjure_enum final
 	static constexpr auto cend() noexcept { return entries.cend(); }
 	static constexpr auto crbegin() noexcept { return entries.crbegin(); }
 	static constexpr auto crend() noexcept { return entries.crend(); }
-	static constexpr auto front() noexcept { return *entries.cbegin(); }
-	static constexpr auto back() noexcept { return *std::prev(entries.cend()); }
+	static constexpr auto front() noexcept { return *cbegin(); }
+	static constexpr auto back() noexcept { return *std::prev(cend()); }
 
 	static constexpr std::optional<T> int_to_enum(int value) noexcept
 	{
@@ -395,7 +395,7 @@ class enum_bitset
 	U _present{};
 
 public:
-	constexpr enum_bitset(U bits) noexcept : _present(bits) {}
+	explicit constexpr enum_bitset(U bits) noexcept : _present(bits) {}
 	constexpr enum_bitset(std::string_view from, bool anyscope=false, char sep='|', bool ignore_errors=true)
 		: _present(factory(from, anyscope, sep, ignore_errors)) {}
 
@@ -456,7 +456,7 @@ class enum_bitset
 	constexpr void reset_all() noexcept { (reset<comp>(),...); }
 	template<typename... I>
 	requires(std::is_integral_v<I> && ...)
-	constexpr void reset_all(I...comp) noexcept { (reset(comp),...); };
+	constexpr void reset_all(I...comp) noexcept { (reset(comp),...); }
 
 	constexpr bool test(U pos) const noexcept { return _present & (1 << pos); }
 	constexpr bool test(T what) const noexcept { return test(to_underlying(what)); }