QScopeGuard Class

Related Non-Members

template <typename F> QScopeGuard<typename std::decay<F>::type> qScopeGuard(F &&f)

The qScopeGuard function can be used to call a function at the end of the scope.

Create a scope guard that will execute f at the end of the scope.

This helper function is provided so that you can easily construct a QScopeGuard without having to name the template parameter for the type of the callable. If F is a lambda then you cannot write its type and relying on this helper or class template argument deduction is necessary.

Example usage is as follows:

void myComplexCodeWithMultipleReturnPoints(int v)
{
    // The lambda will be executed right before your function returns
    auto cleanup = qScopeGuard([] { code you want executed goes HERE; });

    if (v == -1)
        return;

    int v2 = code_that_might_throw_exceptions();

    if (v2 == -1)
        return;

    (...)
}