Convert an object of type T to value.

template<
    class T,
    class Context>
void
value_from(
    T&& t,
    Context const& ctx,
    value& jv);
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template<
    class T,
    class Context>
value
value_from(
    T&& t,
    Context const& ctx,
    storage_ptr sp = {});
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template<
    class T>
void
value_from(
    T&& t,
    value& jv);
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template<
    class T>
value
value_from(
    T&& t,
    storage_ptr sp = {});
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