std::vprint_nonunicode(std::ostream)

std::vprint_nonunicode(std::ostream) - cppreference.com

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`void vprint_nonunicode( std::ostream& os, std::string_view fmt, std::format_args args );`		(since C++23)

Behaves as FormattedOutputFunction (except that some details of error reporting differ).

Performs the following operations in order:

First, constructs and checks the sentry object.
Then, initializes an automatic variable as if by std::string out = std::vformat(os.getloc(), fmt, args);.
Finally, inserts the character sequence [out.begin(), out.end()) into os.

os - output stream to insert data into

fmt

an object that represents the format string. The format string consists of

ordinary characters (except { and }), which are copied unchanged to the output,
escape sequences {{ and }}, which are replaced with { and } respectively in the output, and
replacement fields.

Each replacement field has the following format:

1) replacement field without a format specification

2) replacement field with a format specification

arg-id	-	specifies the index of the argument in `args` whose value is to be used for formatting; if it is omitted, the arguments are used in order. The arg-id s in a format string must all be present or all be omitted. Mixing manual and automatic indexing is an error.
format-spec	-	the format specification defined by the std::formatter specialization for the corresponding argument. Cannot start with `}`.

For basic types and standard string types, the format specification is interpreted as standard format specification.
For chrono types, the format specification is interpreted as chrono format specification.

For range types, the format specification is interpreted as range format specification.
For std::pair and std::tuple, the format specification is interpreted as tuple format specification.
For std::thread::id and std::stacktrace_entry, see thread id format specification and stacktrace entry format specification.
For std::basic_stacktrace, no format specifier is allowed.

(since C++23)

For other formattable types, the format specification is determined by user-defined formatter specializations.

args - arguments to be formatted

std::bad_alloc on allocation failure.
Propagate any exception thrown by any formatter, e.g. std::format_error, without regard to the value of os.exceptions() and without turning on std::ios_base::badbit in the error state of os.
May throw std::ios_base::failure caused by os.setstate(ios_base::badbit) which is called if an insertion into os fails.

Feature-test macro	Value	Std	Feature
`__cpp_lib_print`	`202207L`	(C++23)	Formatted output
`__cpp_lib_format`	`202207L`	(C++23)	Exposing std::basic_format_string