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std::vprint_nonunicode

Defined in header <print>
void vprint_nonunicode( std::FILE* stream,
                        std::string_view fmt, std::format_args args );
(1) (since C++23)
void vprint_nonunicode( std::string_view fmt, std::format_args args );
(2) (since C++23)

Format args according to the format string fmt, and writes the result to the stream.

1) Writes the result of std::vformat(fmt, args) to the stream. The behavior is undefined if stream is not a valid pointer to a C stream.
2) same as (1) when stream is equal to the standard C output stream stdout, i.e.
std::vprint_nonunicode(stdout, fmt, args);

Parameters

stream - output file stream to write to
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:

{ arg-id (optional) } (1)
{ arg-id (optional) : format-spec } (2)
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-ids 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.
args - arguments to be formatted

Return value

(none).

Exceptions

Notes

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

Example

See also

(C++23)
prints to Unicode capable stdout or a file stream using type-erased argument representation
(function)
(C++23)
outputs character data using type-erased argument representation
(function)
(C++23)
prints to stdout or a file stream using formatted representation of the arguments
(function template)
(C++20)
stores formatted representation of the arguments in a new string
(function template)

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