# std::formatter<std::basic_stacktrace>

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< cpp‎ | utility‎ | basic stacktrace

Defined in header `<stacktrace>` |  |
template< class Allocator > struct formatter< std::basic_stacktrace <Allocator>>; |  | (since C++23)

The template specialization of std::formatter for std::basic_stacktrace<Allocator> allows users to convert a stacktrace object to string using formatting functions such as std::format.

No format specifier is allowed.

A stacktrace object s is formatted as if by copying `std::to_string` (s) to the output.

### Example

Run this code

    #include <format>
    #include <iostream>
    #include <stacktrace>

    int main()
    {
        auto trace = std::stacktrace::current();
        std::cout << std::format("{}\n", trace);
    }

Possible output:

     0# 0x0000000000402D97 in ./prog.exe
     1# __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
     2# 0x0000000000402CA9 in ./prog.exe

### See also

formatter (C++20) | defines formatting rules for a given type (class template)
print (C++23) | prints to stdout or a file stream using formatted representation of the arguments (function template)

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