template< class OutputIt, class CharT >
class basic_format_context;
using format_context = basic_format_context</* unspecified */, char>;
(2) (since C++20)using wformat_context = basic_format_context</* unspecified */, wchar_t>;
(3) (since C++20)Provides access to formatting state consisting of the formatting arguments and the output iterator.
2)The unspecified template argument is an output iterator that appends to
std::string, such as
std::back_insert_iterator<std::string>. Implementations typically use an iterator to type-erased buffer type that supports appending to any contiguous and resizable container.
3)The unspecified template argument is an output iterator that appends to
std::wstring.
The behavior is undefined if OutputIt does not model std::output_iterator<const CharT&>.
A program that declares an explicit or partial specialization of std::basic_format_context is ill-formed, no diagnostic required.
std::basic_format_context objects can only be created by the implementation. User codes are only allowed to modify the format context via the format function of std::formatter specializations.
iterator OutputIt char_type CharT [edit] Member alias templates [edit] Member functions basic_format_context cannot be constructed by user code
basic_format_context is not assignable
Returns a std::basic_format_arg holding the id-th argument in args, where args is the parameter pack or std::basic_format_args object passed to the formatting function.
If id is not less than the number of formatting arguments, returns a default-constructed std::basic_format_arg (holding a std::monostate object).
Returns the locale passed to the formatting function, or a default-constructed std::locale if the formatting function does not take a locale.
std::basic_format_context::outReturns the iterator to the output buffer. The result is move-constructed from the stored iterator.
std::basic_format_context::advance_tovoid advance_to( iterator it );
Move assigns it to the stored output iterator. After a call to advance_to, the next call to out() will return an iterator with the value that it had before the assignment.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 3567 C++20basic_format_context does not work move-only iterator types made to move iterators LWG 3975 C++20 user specialization of basic_format_context was allowed disallowed LWG 4061 C++20 basic_format_context was constructible and assignable by user code made neither constructible nor assignable
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4