From bd11b54c75520e78b782eb6b4e25b1ca616466de Mon Sep 17 00:00:00 2001
From: Vladimir Ivanov <knebekaizer@gmail.com>
Date: Sat, 9 Apr 2022 00:49:55 +0300
Subject: [PATCH] Exception example

---
 examples/vector_size_sample/CMakeLists.txt |  6 ++++++
 examples/vector_size_sample/fancy_ptr.cpp  |  8 +++++++-
 examples/vector_size_sample/fancy_ptr.h    | 13 ++++++++++++-
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/examples/vector_size_sample/CMakeLists.txt b/examples/vector_size_sample/CMakeLists.txt
index 3ce9ebf..73340c2 100644
--- a/examples/vector_size_sample/CMakeLists.txt
+++ b/examples/vector_size_sample/CMakeLists.txt
@@ -12,3 +12,9 @@ add_executable(fancy_ptr
         fancy_ptr.h
     )
 
+add_executable(fancy_ptr_trace
+        fancy_ptr.cpp
+        fancy_ptr.h
+        stacktrace.cpp
+    )
+
diff --git a/examples/vector_size_sample/fancy_ptr.cpp b/examples/vector_size_sample/fancy_ptr.cpp
index 0f519f1..7245e7c 100644
--- a/examples/vector_size_sample/fancy_ptr.cpp
+++ b/examples/vector_size_sample/fancy_ptr.cpp
@@ -32,9 +32,12 @@
 
 #include "fancy_ptr.h"
 
+#include <iostream>
 #include <cassert>
 #include <vector>
 
+using namespace std;
+
 extern "C" int foo([[maybe_unused]] const int* buf, [[maybe_unused]] unsigned long n) {
 	return 0;
 }
@@ -59,10 +62,13 @@ void foo_at_lvalue(FancyVec& v, size_t n) {
 	v.at(n) = 42;
 }
 
-void test() {
+void test() try {
 	FancyVec v(10);
 	v.insert(v.end(), 42);
 	assert(v.size() == 11);
+} catch (std::exception& e) {
+	cerr << "[ERROR] terminating with exception:\n" << e.what() << endl;
+//	throw;
 }
 
 // Explicit instantiation
diff --git a/examples/vector_size_sample/fancy_ptr.h b/examples/vector_size_sample/fancy_ptr.h
index fdaebd1..65ab96e 100644
--- a/examples/vector_size_sample/fancy_ptr.h
+++ b/examples/vector_size_sample/fancy_ptr.h
@@ -29,8 +29,18 @@
 using std::nullptr_t;
 using std::true_type;
 
+#include <string>
+#include <exception>
+std::string Backtrace(int skip = 1);
+
 namespace my {
 
+class Error : public std::runtime_error {
+public:
+	Error(const std::string& s) : std::runtime_error(s) {}
+};
+
+inline void throw_my() { throw Error(Backtrace(2)); }
 
 template<class Tp> class Ptr;
 template<class Tp> class CPtr;
@@ -114,7 +124,7 @@ struct CPtr {
 	CPtr(nullptr_t) : p_(nullptr) {}
 	CPtr(const T* p) : p_(p) {}
 
-	CPtr(const Ptr<T>& p) : CPtr(p.p_) {}
+	CPtr(const Ptr<T>& p) : p_(p.p_) { throw_my(); }
 
 	CPtr(const CPtr<T> &) = default;
 	CPtr(CPtr<T> &&) = default;
@@ -178,6 +188,7 @@ ptrdiff_t operator-(const Ptr<T>& a, const Ptr<T> b) {
 	return a.p_ - b.p_;
 }
 
+
 template<class Tp>
 class custom_allocator;