Macros

Constrained template macros
Version macros
BOOST_OUTCOME_DISABLE_EXECINFO
If defined, disables the use of the <execinfo.h> header (or the win32 emulation).
BOOST_OUTCOME_NODISCARD
How to tell the compiler than the return value of a function should not be discarded without examining it.
BOOST_OUTCOME_REQUIRES(...)
A C++ 20 requires(...), if available.
BOOST_OUTCOME_SYMBOL_VISIBLE
How to mark throwable types as always having default ELF symbol visibility.
BOOST_OUTCOME_THREAD_LOCAL
How to mark variables as having thread local storage duration.
BOOST_OUTCOME_THROW_EXCEPTION(expr)
How to throw a C++ exception, or equivalent thereof.
BOOST_OUTCOME_TRY(var, expr)
Evaluate an expression which results in a type matching the ValueOrError<T, E> concept, assigning T to a variable called var if successful, immediately returning try_operation_return_as(expr) from the calling function if unsuccessful.
BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)
Evaluate an expression which results in a type matching the ValueOrError<void, E> concept, continuing execution if successful, immediately returning try_operation_return_as(expr) from the calling function if unsuccessful.
BOOST_OUTCOME_TRYX(expr)
Evaluate an expression which results in a type matching the ValueOrError<T, E> concept, emitting the T if successful, immediately returning try_operation_return_as(expr) from the calling function if unsuccessful.
BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE
How to implement in_place_type_t<T> and in_place_type<T>.
BOOST_OUTCOME_USE_STD_IS_NOTHROW_SWAPPABLE
How to implement is_nothrow_swappable<T>.