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datatypes.hpp
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/
datatypes.hpp
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// (c) 2013 Stephan Hohe
#if !defined(SQXX_DATATYPES_HPP_INCLUDED)
#define SQXX_DATATYPES_HPP_INCLUDED
#include <utility>
#include <string>
namespace sqxx {
struct blob {
const void *data;
uint64_t length;
blob(const void *data_arg, int length_arg) : data(data_arg), length(length_arg) {
}
};
template<typename T=int64_t>
struct tcounter {
T current;
T highwater;
tcounter() = default;
template<typename U>
tcounter(const tcounter<U> &other) : current(other.current), highwater(other.highwater) {
}
};
typedef tcounter<int64_t> counter;
namespace detail {
// Check if type T is the same as any of the ones listed in Ts...
template<typename T, typename... Ts>
struct is_selected;
template<typename T>
struct is_selected<T> {
static const bool value = false;
};
template<typename T, typename T2, typename... Ts>
struct is_selected<T, T2, Ts...> {
static const bool value = std::is_same<T, T2>::value || is_selected<T, Ts...>::value;
};
template<typename T>
using decays_to_function = std::is_function<std::remove_pointer_t<std::decay_t<T>>>;
template<typename T>
constexpr bool decays_to_function_v = decays_to_function<T>::value;
}
/** `std::enable_if<>` for all types in the `Ts...` list */
template<typename T, typename R, typename... Ts>
using if_selected_type = typename std::enable_if<detail::is_selected<T, Ts...>::value, R>::type;
/** `std::enable_if<>` for the types supported by sqxx's db interface
* (`int`, `int64_t`, `double`, `const char*`, `std::string`, `blob`)
*/
template<typename T, typename R>
using if_sqxx_db_type = if_selected_type<T, R,
int, int64_t, double, const char*, std::string, blob>;
enum class datatype {
INTEGER = 1,
FLOAT = 2,
TEXT = 3,
BLOB = 4,
NULLVALUE = 5,
};
// Helper template to denote intentionally unused parameters.
// Quiets compiler warnings about them.
template<typename T>
void unused(T) {
}
} // namespace sqxx
#endif // SQXX_DATATYPES_HPP_INCLUDED