Function input_adapter

extern/json/json.hpp:6455–6459

// General purpose iterator-based input
template<typename IteratorType>
typename iterator_input_adapter_factory<IteratorType>::adapter_type input_adapter(IteratorType first, IteratorType last)
{
    using factory_type = iterator_input_adapter_factory<IteratorType>;
    return factory_type::create(first, last);
}

// Convenience shorthand from container to iterator
// Enables ADL on begin(container) and end(container)