boostorg
Allow the use of std::optional in C++2017
It would be good if std::optional<T> were used in projects that use C++2017.
A define like that which is available in boost.dll 1.70 would suffice in my opinion.
This isn’t something that is user facing.
Within the boost format library boost::optional is used, what I’m asking for is a define to use std::optional instead, like boost.dll does with boost/std::filesystem. If I get a chance next week, I’ll create a PR.
From: James E. King III [email protected] Sent: 19 April 2019 11:56 To: boostorg/format [email protected] Cc: Sean Farrow [email protected]; Author [email protected] Subject: Re: [boostorg/format] Allow the use of std::optional in C++2017 (#63)
Could you be more specific, perhaps provide an example use?
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Isn't there an language macro that is defined the the compiler supports the standard optional instead of the boost one that can be checked against like there is with CXX_LIB_FILESYSTEM/CXX_LIB_EXPERIMENTAL_FILESYSTEM or something along those lines that can be used with boost?
(unrelated but I want to also figure out things I can use in place of format and wformat used in this lib so that way a program of mine could be made a bit more optimized.)
(hmm so is
typedef lagged_fibonacci_01_engine<double, 48, 607, 273> lagged_fibonacci607;
the same as this?
std::subtract_with_carry_engine<double, 48, 607, 273>
)
