c-resources/CPlusPlus20ForProgrammers-m.../examples/ch12/fig12_05/fig12_05.cpp

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// fig12_05.cpp
// Demonstrating a function try block.
#include <fmt/format.h>
#include <iostream>
#include <limits>
#include <stdexcept>
// class Integer purposely throws an exception from its constructor
class Integer {
public:
explicit Integer(int i) : value{i} {
std::cout << fmt::format("Integer constructor: {}\n", value)
<< "Purposely throwing exception from Integer constructor\n";
throw std::runtime_error("Integer constructor failed");
}
private:
int value{};
};
class ResourceManager {
public:
ResourceManager(int i) try : myInteger(i) {
std::cout << "ResourceManager constructor called\n";
}
catch (const std::runtime_error& ex) {
std::cout << fmt::format(
"Exception while constructing ResourceManager: ", ex.what())
<< "\nAutomatically rethrowing the exception\n";
}
private:
Integer myInteger;
};
int main() {
try {
const ResourceManager resource{7};
}
catch (const std::runtime_error& ex) {
std::cout << fmt::format("Rethrown exception caught in main: {}\n",
ex.what());
}
}
/**************************************************************************
* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************/