Skip to main content

Levels of exception-safety

There can be levels of exception safety requirements from a class/component/method:

* The basic exception guarantee: The invariants of the component are preserved, and no resources are leaked in the face of an exception.

* The strong exception guarantee: The operation has either completed successfully or thrown an exception, leaving the program state exactly as it was before the operation started. (commit-or-rollback semantics.)

* The no-throw exception guarantee: The operation will not throw an exception.

* The exception-neutrality: In a generic component, we usually have an additional expectation of exception-neutrality, which means that exceptions thrown by a component's type parameters (template parameter) should be propagated, unchanged, to the component's caller.

----
SRC: http://www.boost.org/more/generic_exception_safety.html

Comments

Anonymous said…
Pod people
Can you hear the beer? Tom Maxedon, 32, Traci Lutton, 30, and Jeffrey Meyer, 42, talk about microbrewed beer and interview a band while recording Meyer's award-winning podcast, "The Good Beer Show," at the ...
Hi, I was just blog surfing and found you! If you are interested, go see my make money related site. It is special to me plus you may find something of interest.This has a great business opportunity as well
Anonymous said…
Astonshing blog. I relished in the site and you
know I will be going to it again! Surfing the internet
hepls me to find blogs that arfe just as good.
Please consider looking at my blog.
thanks you!
gclub

Popular Content

Unit Testing C++ Templates and Mock Injection Using Traits

Unit testing your template code comes up from time to time. (You test your templates, right?) Some templates are easy to test. No others. Sometimes it's not clear how to about injecting mock code into the template code that's under test. I've seen several reasons why code injection becomes challenging. Here I've outlined some examples below with roughly increasing code injection difficulty. Template accepts a type argument and an object of the same type by reference in constructor Template accepts a type argument. Makes a copy of the constructor argument or simply does not take one Template accepts a type argument and instantiates multiple interrelated templates without virtual functions Lets start with the easy ones. Template accepts a type argument and an object of the same type by reference in constructor This one appears straight-forward because the unit test simply instantiates the template under test with a mock type. Some assertion might be tested in

Multi-dimensional arrays in C++11

What new can be said about multi-dimensional arrays in C++? As it turns out, quite a bit! With the advent of C++11, we get new standard library class std::array. We also get new language features, such as template aliases and variadic templates. So I'll talk about interesting ways in which they come together. It all started with a simple question of how to define a multi-dimensional std::array. It is a great example of deceptively simple things. Are the following the two arrays identical except that one is native and the other one is std::array? int native[3][4]; std::array<std::array<int, 3>, 4> arr; No! They are not. In fact, arr is more like an int[4][3]. Note the difference in the array subscripts. The native array is an array of 3 elements where every element is itself an array of 4 integers. 3 rows and 4 columns. If you want a std::array with the same layout, what you really need is: std::array<std::array<int, 4>, 3> arr; That's quite annoying for

Covariance and Contravariance in C++ Standard Library

Covariance and Contravariance are concepts that come up often as you go deeper into generic programming. While designing a language that supports parametric polymorphism (e.g., templates in C++, generics in Java, C#), the language designer has a choice between Invariance, Covariance, and Contravariance when dealing with generic types. C++'s choice is "invariance". Let's look at an example. struct Vehicle {}; struct Car : Vehicle {}; std::vector<Vehicle *> vehicles; std::vector<Car *> cars; vehicles = cars; // Does not compile The above program does not compile because C++ templates are invariant. Of course, each time a C++ template is instantiated, the compiler creates a brand new type that uniquely represents that instantiation. Any other type to the same template creates another unique type that has nothing to do with the earlier one. Any two unrelated user-defined types in C++ can't be assigned to each-other by default. You have to provide a