From cppreference.com
size_typesize()constnoexcept;(since C++23)Returns the number of entries in the stacktrace.
Parameters
(none)
Return value
The number of entries in the stacktrace.
Complexity
Constant.
Example
The following code uses size to display the number of entries in the current stacktrace:
Run this code
#include<stacktrace>#include<iostream>intmain(){autotrace=std::stacktrace::current();std::cout<<"trace contains "<<trace.size()<<" entries.\n";}Possible output:
trace contains 3 entries. See also
checks whether the basic_stacktrace is empty
(public member function)
returns the maximum possible number of stacktrace entries
(public member function)