Config

Minimal support for broken or incomplete implementations is attained by littering the code with macros. The library uses these macros to downgrade or remove functionality that would otherwise result in a compilation error.

Macro	Replacement	Fallback
`EGGS_CXX11_HAS_CONSTEXPR`	`1`	`0`
`EGGS_CXX11_CONSTEXPR`	`constexpr`	``
`EGGS_CXX11_STATIC_CONSTEXPR`	`static constexpr`	`static const`
`EGGS_CXX14_HAS_CONSTEXPR`	`1`	`0`
`EGGS_CXX14_CONSTEXPR`	`constexpr`	``
`EGGS_CXX98_HAS_RTTI`	`1`	`0`
`EGGS_CXX11_HAS_CONSTEXPR_RTTI`	`1`	`0`
`EGGS_CXX98_HAS_EXCEPTIONS`	`1`	`0`
`EGGS_CXX11_NORETURN`	`[[noreturn]]`	``
`EGGS_CXX11_HAS_SFINAE_FOR_EXPRESSIONS`	`1`	`0`
`EGGS_CXX14_HAS_VARIABLE_TEMPLATES`	`1`	`0`
`EGGS_CXX17_HAS_INLINE_VARIABLES`	`1`	`0`
`EGGS_CXX17_INLINE`	`inline`	``
`EGGS_CXX11_STD_HAS_IS_NOTHROW_TRAITS`	`1`	`0`
`EGGS_CXX11_STD_HAS_IS_TRIVIALLY_COPYABLE`	`1`	`0`
`EGGS_CXX11_STD_HAS_IS_TRIVIALLY_DESTRUCTIBLE`	`1`	`0`
`EGGS_CXX17_STD_HAS_CONSTEXPR_ADDRESSOF`	`1`	`0`
`EGGS_CXX17_STD_HAS_SWAPPABLE_TRAITS`	`1`	`0`

The macros are defined to their corresponding replacement, except for known incomplete implementations where they are defined to their corresponding fallback instead. These macros can be overriden by the user by defining them before including any library header.

[Note: The configuration macros are not part of the public interface of the library, and are not leaked into user code.]