etl/docs/utilities/etl-traits.md

title
ETL Traits

{{< callout type="info">}} Header: various
Since: TBC
{{< /callout >}}

A set of traits that reflect the platform settings. It gives a C++ style interface to the library macros. The traits are accessed under the etl::traits namespace. All traits are constexpr for C++11 and above, const for C++03 and below.

Traits

Trait	Type	Defined by	Macro
using_stl	bool	platform.h	ETL_USING_STL
using_stlport	bool	platform.h	ETL_USING_STLPORT
using_cpp11	bool	platform.h	ETL_USING_CPP11
using_cpp14	bool	platform.h	ETL_USING_CPP14
using_cpp17	bool	platform.h	ETL_USING_CPP17
using_cpp20	bool	platform.h	ETL_USING_CPP20
using_cpp23	bool	platform.h	ETL_USING_CPP23
cplusplus	long	builtin	__cplusplus
language_standard	int	platform.h	ETL_LANGUAGE_STANDARD
using_exceptions	bool	platform.h	ETL_USING_EXCEPTIONS
using_gcc_compiler	bool	platform.h	ETL_USING_GCC_COMPILER
using_microsoft_compiler	bool	platform.h	ETL_USING_MICROSOFT_COMPILER
using_arm5_compiler	bool	platform.h	ETL_USING_ARM5_COMPILER
using_arm6_compiler	bool	platform.h	ETL_USING_ARM6_COMPILER
using_arm7_compiler	bool	platform.h	ETL_USING_ARM7_COMPILER
using_clang_compiler	bool	platform.h	ETL_USING_CLANG_COMPILER
using_green_hills_compiler	bool	platform.h	ETL_USING_GREEN_HILLS_COMPILER
using_iar_compiler	bool	platform.h	ETL_USING_IAR_COMPILER
using_intel_compiler	bool	platform.h	ETL_USING_INTEL_COMPILER
using_texas_instruments_compiler	bool	platform.h	ETL_USING_TEXAS_INSTRUMENTS_COMPILER
using_builtin_is_assignable	bool	platform.h	ETL_USING_BUILTIN_IS_ASSIGNABLE
using_builtin_is_constructible	bool	platform.h	ETL_USING_BUILTIN_IS_CONSTRUCTIBLE
using_builtin_is_trivially_constructible	bool	platform.h	ETL_USING_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE
using_builtin_is_trivially_destructible	bool	platform.h	ETL_USING_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE
using_builtin_is_trivially_copyable	bool	platform.h	ETL_USING_BUILTIN_IS_TRIVIALLY_COPYABLE
using_builtin_underlying_type	bool	platform.h	ETL_USING_BUILTIN_UNDERLYING_TYPE
using_builtin_memcpy	bool	platform.h	ETL_USING_BUILTIN_MEMCPY
using_builtin_memmove	bool	platform.h	ETL_USING_BUILTIN_MEMMOVE
using_builtin_memset	bool	platform.h	ETL_USING_BUILTIN_MEMSET
using_builtin_memcmp	bool	platform.h	ETL_USING_BUILTIN_MEMCMP
using_builtin_memchr	bool	platform.h	ETL_USING_BUILTIN_MEMCHR
using_generic_compiler	bool	platform.h	ETL_USING_GENERIC_COMPILER
has_8bit_types	bool	platform.h	ETL_USING_8BIT_TYPES
has_64bit_types	bool	platform.h	ETL_USING_64BIT_TYPES
has_atomic	bool	platform.h	ETL_HAS_ATOMIC
has_mutex	bool	mutex.h	ETL_HAS_MUTEX
has_nullptr	bool	platform.h	ETL_HAS_NULLPTR
has_char8_t	bool	platform.h	ETL_HAS_CHAR8_T
has_native_char8_t	bool	platform.h	ETL_HAS_NATIVE_CHAR8_T
has_native_char16_t	bool	platform.h	ETL_HAS_NATIVE_CHAR16_T
has_native_char32_t	bool	platform.h	ETL_HAS_NATIVE_CHAR32_T
has_string_truncation_checks	bool	platform.h	ETL_HAS_STRING_TRUNCATION_CHECKS
has_error_on_string_truncation	bool	platform.h	ETL_HAS_ERROR_ON_STRING_TRUNCATION
has_string_clear_after_use	bool	platform.h	ETL_HAS_STRING_CLEAR_AFTER_USE
has_istring_repair	bool	platform.h	ETL_HAS_ISTRING_REPAIR
has_ivector_repair	bool	platform.h	ETL_HAS_IVECTOR_REPAIR
has_mutable_array_view	bool	platform.h	ETL_HAS_MUTABLE_ARRAY_VIEW
has_ideque_repair	bool	platform.h	ETL_HAS_IDEQUE_REPAIR
has_initializer_list	bool	platform.h	ETL_HAS_INITIALIZER_LIST
is_debug_build	bool	platform.h	ETL_IS_DEBUG_BUILD
version	long	version.h	ETL_VERSION_VALUE
version_major	long	version.h	ETL_VERSION_MAJOR
version_minor	long	version.h	ETL_VERSION_MINOR
version_patch	long	version.h	ETL_VERSION_PATCH
version_string	const char*	version.h	ETL_VERSION
version_wstring	const wchar_t *	version.h	ETL_VERSION_W
version_u8string	const char8_t*	version.h	ETL_VERSION_U8 if has_native_char8_t
version_u16string	const char16_t*	version.h	ETL_VERSION_U16
version_u32string	const char32_t*	version.h	ETL_VERSION_U32

Examples

if constexpr(etl::traits::is_debug_build)
{
  std::cerr << etl::traits::version_string;
}

---

template <bool Has_Atomic = etl::traits::has_atomic>
class Controller;

template<>
class Controller<false>
{
  etl::mutex lock;
};

template<>
class Controller<true>
{
  etl::atomic_int lock;
};