std::vprint_nonunicode(std::ostream)
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< cpp | io | basic ostream
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Member functions Formatted output Unformatted output Positioning Miscellaneous Member classes Non-member functions
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(C++23)
vprint_nonunicode(std::ostream)
(C++23)
Defined in header
<ostream>
void vprint_nonunicode( std::ostream & os,
std::string_view fmt, std::format_args args );
(since C++23)
std::string_view fmt, std::format_args args );
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)Contents
[edit] Parameters
os
-
output stream to insert data into
fmt
-
an object that represents the format string. The format string consists of
args
-
arguments to be formatted
- 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-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++26)
- For other formattable types, the format specification is determined by user-defined
formatterspecializations.
[edit] Exceptions
- 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.
[edit] Notes
| 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 |
[edit] Example
This section is incomplete
Reason: no example
Reason: no example