反復中に `std::vector` から要素を安全に削除するにはどうすればよいですか?

<code class="cpp">for (iterator it = begin; it != end(container) /* !!! */; )
{
    if (it->somecondition())
    {
        it = vec.erase(it);  // Returns the new iterator to continue from.
    }
    else
    {
        ++it;
    }
}</code>

<code class="cpp">iterator it = std::remove_if(begin, end, pred);
vec.erase(it, vec.end());</code>

<code class="cpp">struct predicate
{
    bool operator()(const T& pX) const
    {
        return pX.shouldIBeRemoved();
    }
};</code>

<code class="cpp">class remove_by_caller
{
public:
    remove_by_caller(AguiWidgetBase* pWidget) : mWidget(pWidget) {}
    template <typename T>
    bool operator()(const T& pX) const
    {
        return pX.getCaller() == mWidget;
    }
private:
    AguiWidgetBase* mWidget;
};</code>

<code class="cpp">std::vector<AguiTimedEvent>::iterator it =
    std::remove_if(timedEvents.begin(), timedEvents.end(), remove_by_caller(widget));
timedEvents.erase(it, timedEvents.end());</code>