Jeff Garland

Intro

Not about ranges

• Up to date with respect to Cologne
• Summary
• boost datetime

Goals

• io – formatted output (15min)
• container and algorith updates (12min)
• chrono (8min)
• concurrency (10min)
• misc(5min)
• bit manip (5min)

Not goals

• ranges
• concept
• spaceship
• concurrency other topics
• char8_t, u8string_view, etc
• constexpr, …

environment

• g++ 8.2
• -fconcepts -c++20
• en.cppreference.com/w/cpp/compiler_support
• wg21.link/n4830

std::format

• python style formatting
• faster and less overhead
• string s = fmt::format(“{} there {}\n”, “hello”, “world”);
• floating point
• rich languate for fill, alignment
• custom types
• template specialization
• fmt diagnostics/saefty
• runtime diagnostic (std::exception)
• wg21.link/p0645
• https://github.com/fmtlib/fmt

syncbuf and osyncstream

stringstream and basic_stringbuf

• control of buffer allocator
• stringstream.view() so no need to copy string
• p0408

container and algorithm

• span view over contiguous seqnce
• cheap to copy
• constant time complexity
• mutable
• P0122
• github.com/tcbrindle/span

• contains()

  for associative containers

• p0458
• uniform container erasure
• library fundamentals v2

chrono

• structure/field types like year_month_day
• calculation types ike sys_days, time_point, seconds
• field types sed for i/o and conversions
• no exceptions
• fmt i/o
• https:://github.com/HowardHinnand/date
• p0355

Concurrency

• jthread and stop_token
• atomic<shared_ptr> and weak_ptr<>
• p0718
• jthread automatically joins in destructor
• stop_token provides cooperator shutdown
• p0660 (wording) p0660r0 (motivation)
• github.com/josuttis/jthread
• atomic_ref

misc

• string_view starts_with() and ends_with()
• source_location
• modern replace for FILE and LINE
• static consteval source_location current() noexcpt;
• p1208
• math constants
• <math>
• p0631
• 1midpoint()` difficult
• bit manipulation
• <bit>
• p0553
• bit_cast
• p0476
• endian
• p0463