Macros

1. Constrained template macros
2. Version macros
3. BOOST_OUTCOME_CO_TRY(var, expr)

Evaluate within a coroutine an expression which results in an understood type, assigning T to a decl called var if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

4. BOOST_OUTCOME_CO_TRYV(expr)/BOOST_OUTCOME_CO_TRY(expr)

Evaluate from within a coroutine an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

5. BOOST_OUTCOME_CO_TRYV2(spec, expr)

Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

6. BOOST_OUTCOME_CO_TRYV2_FAILURE_LIKELY(spec, expr)

Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

7. BOOST_OUTCOME_CO_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(expr)

Evaluate from within a coroutine an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

8. BOOST_OUTCOME_CO_TRYX(expr)

Evaluate from within a coroutine an expression which results in an understood type, emitting the T if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

9. BOOST_OUTCOME_CO_TRYX_FAILURE_LIKELY(expr)

Evaluate from within a coroutine an expression which results in an understood type, emitting the T if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

10. BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(var, expr)

Evaluate within a coroutine an expression which results in an understood type, assigning T to a decl called var if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

11. BOOST_OUTCOME_DISABLE_EXECINFO

If defined, disables the use of the <execinfo.h> header (or the win32 emulation).

12. BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR

Enables backwards features and naming compatibility for earlier versions of Outcome.

13. BOOST_OUTCOME_NODISCARD

How to tell the compiler than the return value of a function should not be discarded without examining it.

14. BOOST_OUTCOME_REQUIRES(...)

A C++ 20 requires(...), if available.

15. BOOST_OUTCOME_SYMBOL_VISIBLE

How to mark throwable types as always having default ELF symbol visibility.

16. BOOST_OUTCOME_THREAD_LOCAL

How to mark variables as having thread local storage duration.

17. BOOST_OUTCOME_THROW_EXCEPTION(expr)

How to throw a C++ exception, or equivalent thereof.

18. BOOST_OUTCOME_TRY(var, expr)

Evaluate an expression which results in an understood type, assigning T to a decl called var if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

19. BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)

Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

20. BOOST_OUTCOME_TRYV2(spec, expr)

Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

21. BOOST_OUTCOME_TRYV2_FAILURE_LIKELY(spec, expr)

Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

22. BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_TRY_FAILURE_LIKELY(expr)

Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

23. BOOST_OUTCOME_TRYX(expr)

Evaluate an expression which results in an understood type, emitting the T if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

24. BOOST_OUTCOME_TRYX_FAILURE_LIKELY(expr)

Evaluate an expression which results in an understood type, emitting the T if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

25. BOOST_OUTCOME_TRY_FAILURE_LIKELY(var, expr)

Evaluate an expression which results in an understood type, assigning T to a decl called var if successful, immediately returning try_operation_return_as(X) from the calling function if unsuccessful.

26. BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE

How to implement in_place_type_t<T> and in_place_type<T>.

27. BOOST_OUTCOME_USE_STD_IS_NOTHROW_SWAPPABLE

How to implement is_nothrow_swappable<T>.