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如何创建堆栈中的结构的垃圾收集副本？

来自C++背景,我的第一个猜测将是一个像下面那样的复制构造函数,但对于D来说它似乎不是很惯用,而且我没有在任何D项目中看到过我看过的.

struct Foo {
    immutable int bar;

    this(int b) { bar = b; }

    // A C++-style copy constructor works but doesn't seem idiomatic.
    this(ref const Foo f) { bar = f.bar; }
}

void main()
{
    // We initialize a Foo on the stack
    auto f = Foo(42);

    // Now I want to get a heap copy of its member. How?

    // A C++-style copy constructor works but doesn't seem idiomatic.
    Foo* f1 = new Foo(f);
}