Since C++17, using template specialization 'std::allocator<void>' in any shape or form (even just mentioning it) is deprecated! A simple workaround is replacing 'void' by another (preferably empty) type, e.g. 'fmt::monostate'.
Found by Clang 9 in Visual Studio.
C++17 deprecated 'std::result_of' in favour of 'std::invoke_result' and will ban it outright in C++20. Therefore
- implement 'internal::result_of' in terms of 'std::invoke_result' when compiling C++17 mode.
- implement 'internal::result_of' in terms of 'std::result_of' when compiling in modes C++11 or C++14.
Signed-off-by: Daniela Engert <dani@ngrt.de>
Howard Hinnant's 'date' library recently gained these two new formatting specifiers. This implementation in {fmt} includes support for 'std::chrono::duration' specializations with floating-point representation types and user-definable precision.
Signed-off-by: Daniela Engert <dani@ngrt.de>
Mostly equivalent to 'sprintf(const S &format, const Args & ... args)' but generates at most 'n' characters through output iterator 'it'. The output type is the same as with 'format_to_n'.
Signed-off-by: Daniela Engert <dani@ngrt.de>
The iterator class itself and its helpers 'to_pointer' are removed after reformulating the formatting loop in terms of a 'basic_string_view<Char>::iterator'.
Signed-off-by: Daniela Engert <dani@ngrt.de>
The sheer presence of 'std::gmtime' or 'std::localtime' gives rise to C4996 warnings in Microsofts compilers. Alas, the 'fallback(internal::null<>)'functions containing these library calls are never ADL-picked in the respective 'handle(internal::null<>)' selectors. Therefore hiding the fallbacks from msvc is perfectly fine.
std::back_insert_iterators model the OutputIterator concept but differ considerably in their traits and behavior. In particular the former made compilation to fail when format_to_n is given a back_inserter as first argument. The emulation of an OutputIterator is not perfect due to the behavioural differences of back_insert_iterators (e.g. assignment always implies increment) but good enough to be used within fmt's machinery.
change total specialization of 'struct formatter<std::tm>' into partial specialization 'template <typename Char> struct formatter<std::tm, Char>', backed by matching 'strftime'-like overloads
Daniela Engert