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added field class

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sascha
2024-03-10 11:51:07 +01:00
parent 2b552c4383
commit dd94ed1020
4 changed files with 153 additions and 18 deletions
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include/matador/sql/field.hpp
+78 -11
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@@ -4,40 +4,107 @@
#include "matador/sql/any_type.hpp"
#include "matador/sql/any_type_to_visitor.hpp"
#include "matador/utils/types.hpp"
#include <optional>
#include <string>
namespace matador::sql {
enum class field_type {
Integer,
FloatingPoint,
String,
Boolean,
Blob,
Null
};
template < typename Type, typename Enable = void >
struct field_traits;
template<typename Type>
struct field_traits<Type, typename std::enable_if<std::is_integral<Type>::value && !std::is_same<Type, bool>::value>::type>
{
static field_type type() { return field_type::Integer; }
};
template<typename Type>
struct field_traits<Type, typename std::enable_if<std::is_floating_point<Type>::value>::type>
{
static field_type type() { return field_type::FloatingPoint; }
};
template<typename Type>
struct field_traits<Type, typename std::enable_if<std::is_same<Type, std::string>::value>::type>
{
static field_type type() { return field_type::String; }
};
template<typename Type>
struct field_traits<Type, typename std::enable_if<std::is_same<Type, bool>::value>::type>
{
static field_type type() { return field_type::Boolean; }
};
template<typename Type>
struct field_traits<Type, typename std::enable_if<std::is_same<Type, nullptr_t>::value>::type>
{
static field_type type() { return field_type::Null; }
};
template<typename Type>
struct field_traits<Type, typename std::enable_if<std::is_same<Type, utils::blob>::value>::type>
{
static field_type type() { return field_type::Blob; }
};
class field
{
public:
explicit field(std::string name);
template<typename Type>
field(std::string name, Type value)
: name_(std::move(name))
, value_(value)
, type_(field_traits<Type>::type()) {}
field(const field &x) = default;
field& operator=(const field &x) = default;
field(field &&x) noexcept;
field& operator=(field &&x) noexcept;
template<typename Type>
field& operator=(Type value) {
value_ = std::move(value);
type_ = field_traits<Type>::type();
return *this;
}
[[nodiscard]] const std::string& name() const;
template<class Type>
Type as() const
std::optional<Type> as() const
{
const Type* ptr= std::get_if<Type>(&value_);
if (ptr) {
return *ptr;
}
any_type_to_visitor<Type> visitor;
std::visit(visitor, const_cast<any_type&>(value_));
return visitor.result;
}
bool is_integer() const;
bool is_floating_point() const;
bool is_bool() const;
bool is_string() const;
bool is_blob() const;
bool is_null() const;
[[nodiscard]] std::string str() const;
[[nodiscard]] bool is_integer() const;
[[nodiscard]] bool is_floating_point() const;
[[nodiscard]] bool is_bool() const;
[[nodiscard]] bool is_string() const;
[[nodiscard]] bool is_blob() const;
[[nodiscard]] bool is_null() const;
friend std::ostream& operator<<(std::ostream &out, const field &col);
private:
std::string name_;
any_type value_;
field_type type_;
};
}