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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../utility/format/vformat.html below:

std::vformat - cppreference.com

Format arguments held by args according to the format string fmt, and return the result as a string. If present, loc is used for locale-specific formatting.

[edit] Parameters 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 loc - std::locale used for locale-specific formatting [edit] Return value

A string object holding the formatted result.

[edit] Exceptions

Throws std::format_error if fmt is not a valid format string for the provided arguments, or std::bad_alloc on allocation failure. Also propagates any exception thrown by formatter or iterator operations.

[edit] Example

#include <format>
#include <iostream>
 
template<typename... Args>
inline void println(const std::format_string<Args...> fmt, Args&&... args)
{
    std::cout << std::vformat(fmt.get(), std::make_format_args(args...)) << '\n';
}
 
int main()
{
    println("{}{} {}{}", "Hello", ',', "C++", -1 + 2 * 3 * 4);
}

Output:

[edit] See also

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