Array Interface Reference

#include <ozo/type_traits.h>

Description

Array concept represents PostgreSQL array.

Array is a Range or Container with fixed or dynamic size. For the type or template which supposed to represent an array ozo::is_array<> should be specialized as std::true_type.

Requirements

#include <ozo/io/array.h> should be included for arrays support.

Concrete models

std::vector, std::list, std::array

Example

The std::vector<> is a dynamic size array and its definition may look like this.

namespace ozo {
template <typename ...Ts>
struct is_array<std::vector<Ts...>> : std::true_type {};
} // namespace ozo

For the std::array<> the definition is slightely different. The std::array<> is a fixed-size container, so it should be pointed via ozo::fit_array_size_impl specialization.

namespace ozo {
template <typename T, std::size_t size>
struct is_array<std::array<T, size>> : std::true_type {};
 
template <typename T, std::size_t S>
struct fit_array_size_impl<std::array<T, S>> {
    static void apply(const std::array<T, S>& array, size_type size) {
        if (size != static_cast<size_type>(array.size())) {
            throw system_error(error::bad_array_size);
        }
    }
};
} // namespace ozo