lib/stacktrace2.cpp

The following code example is taken from the book
C++23 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2026
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <iostream>
#include <print>
#include <array>
#include <stacktrace>

bool find(const auto& coll, int idx)
{
  try {
    for (auto i = 0uz; i <= coll.size(); ++i) {
      if (coll.at(i) == idx) return true;    
    }
  }
  catch (const std::exception&) {
    // create stacktrace:
    std::stacktrace st = std::stacktrace::current();

    // iterate over all entries of the stacktrace:
    std::println("DETAILS:");
    for (const std::stacktrace_entry& entry : st) {
      if (!entry.source_file().empty()) {
        std::println("  {}\n    at {}, line {}", entry.description(),
                                                 entry.source_file(),
                                                 entry.source_line());
      }
    }
  }
  return false;
}

void callTest()
{
  std::array arr{47, 11};

  auto arrHas = [&arr] (int i) {
    return find(arr, i);
  };

  std::cout << (arrHas(42) ? "found 42\n" : "no 42\n");
}

int main()
{
  callTest();
}