std::vprint_nonunicode(std::ostream)

Defined in header `<ostream>`
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.

After writing characters to os, establishes an observable checkpoint.

(since C++26)

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.

(since C++23)

(since C++26)

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 ios_base::badbit in the error state of os.
May throw 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

Compiler support
Freestanding and hosted
Language
Standard library
Standard library headers
Named requirements
Feature test macros (C++20)
Language support library
Concepts library (C++20)
Diagnostics library
Memory management library
Metaprogramming library (C++11)
General utilities library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Strings library
Text processing library
Numerics library
Date and time library
Input/output library
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Technical specifications
Symbols index
External libraries

vprint_unicode(std::ostream) (C++23)	performs Unicode aware output using type-erased argument representation (function) [edit]
print(std::ostream) (C++23)	outputs formatted representation of the arguments (function template) [edit]
operator<<(std::basic_ostream)	inserts character data or insert into rvalue stream (function template) [edit]
vprint_nonunicodevprint_nonunicode_buffered (C++23)	prints to stdout or a file stream using type-erased argument representation (function) [edit]
format (C++20)	stores formatted representation of the arguments in a new string (function template) [edit]

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