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Showing content from https://en.cppreference.com/w/cpp/language/../named_req/../io/basic_ostream/println.html below:

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

Formats args according to the format string fmt with appended '\n' (which means that each output ends with a new-line), and inserts the result into os stream.

The behavior is undefined if std::formatter<Ti, char> does not meet the BasicFormatter requirements for any Ti in Args (as required by std::make_format_args).

[edit] Parameters 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:

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

args... - arguments to be formatted [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

Although overload (2) is added in C++26, all known implementations make it available in C++23 mode.

[edit] Example [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 4088 C++23 (1) ignored the locale imbued in os in formatting arguments such locale is used [edit] See also outputs formatted representation of the arguments
(function template) [edit] same as std::print except that each print is terminated by additional new line
(function template) [edit] stores formatted representation of the arguments in a new string
(function template) [edit]

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