14#if !defined(PQXX_HEADER_PRE)
15# error "Include libpqxx headers as <pqxx/header>, not <pqxx/header.hxx>."
25#if __has_include(<charconv>)
29#if defined(PQXX_HAVE_RANGES) && __has_include(<ranges>)
33#include "pqxx/except.hxx"
34#include "pqxx/util.hxx"
35#include "pqxx/zview.hxx"
81template<
typename TYPE>
92template<
typename TYPE,
typename ENABLE =
void>
struct nullness
109 [[nodiscard]]
static TYPE
null();
140 [[nodiscard]]
static constexpr bool is_null(TYPE
const &)
noexcept
188 [[nodiscard]]
static inline zview
189 to_buf(
char *begin,
char *end, TYPE
const &value);
199 static inline char *
into_buf(
char *begin,
char *end, TYPE
const &value);
215 [[nodiscard]]
static inline std::size_t
250 static constexpr bool converts_to_string{
false};
251 static constexpr bool converts_from_string{
false};
254 oops_forbidden_conversion<TYPE>();
256 [[noreturn]]
static char *
into_buf(
char *,
char *, TYPE
const &)
258 oops_forbidden_conversion<TYPE>();
262 oops_forbidden_conversion<TYPE>();
264 [[noreturn]]
static std::size_t
size_buffer(TYPE
const &)
noexcept
266 oops_forbidden_conversion<TYPE>();
343template<
typename ENUM>
372 [[nodiscard]]
static constexpr zview
373 to_buf(
char *begin,
char *end, ENUM
const &value)
378 static constexpr char *
into_buf(
char *begin,
char *end, ENUM
const &value)
388 [[nodiscard]]
static std::size_t
size_buffer(ENUM
const &value)
noexcept
395 static constexpr impl_type to_underlying(ENUM
const &value)
noexcept
419#define PQXX_DECLARE_ENUM_CONVERSION(ENUM) \
420 template<> struct string_traits<ENUM> : pqxx::internal::enum_traits<ENUM> \
422 template<> inline std::string_view const type_name<ENUM> \
443template<
typename TYPE>
458[[nodiscard]]
inline std::string_view
from_string(std::string_view
text)
472template<
typename T>
inline void from_string(std::string_view
text, T &value)
474 value = from_string<T>(
text);
484template<
typename TYPE>
inline std::string
to_string(TYPE
const &value);
495template<
typename... TYPE>
496[[nodiscard]]
inline std::vector<std::string_view>
497to_buf(
char *here,
char const *end, TYPE... value)
499 return {[&here, end](
auto v) {
501 here = string_traits<
decltype(v)>::into_buf(begin, end, v);
503 auto len{
static_cast<std::size_t
>(here - begin) - 1};
504 return std::string_view{begin, len};
512template<
typename TYPE>
513inline void into_string(TYPE
const &value, std::string &out);
517template<
typename TYPE>
518[[nodiscard]]
inline constexpr bool is_null(TYPE
const &value)
noexcept
520 return nullness<strip_t<TYPE>>::is_null(value);
528template<
typename... TYPE>
529[[nodiscard]]
inline std::size_t size_buffer(TYPE
const &...value)
noexcept
531 return (string_traits<strip_t<TYPE>>::size_buffer(value) + ...);
542template<
typename TYPE>
inline constexpr bool is_sql_array{
false};
558template<
typename TYPE>
inline constexpr bool is_unquoted_safe{
false};
562template<
typename T>
inline constexpr char array_separator{
','};
573template<
typename TYPE>
inline constexpr format param_format(TYPE
const &)
589template<
typename TYPE>
590inline zview generic_to_buf(
char *begin,
char *end, TYPE
const &value)
592 using traits = string_traits<TYPE>;
598 return {begin, traits::into_buf(begin, end, value) - begin - 1};
602#if defined(PQXX_HAVE_CONCEPTS)
611concept binary = std::ranges::contiguous_range<TYPE> and
612 std::is_same_v<strip_t<value_type<TYPE>>, std::byte>;
618#include "pqxx/internal/conversions.hxx"
The home of all libpqxx classes, functions, templates, etc.
Definition array.hxx:33
std::string const type_name
A human-readable name for a type, used in error messages and such.
Definition strconv.hxx:82
void oops_forbidden_conversion() noexcept
Nonexistent function to indicate a disallowed type conversion.
std::string to_string(field const &value)
Convert a field to a string.
Definition result.cxx:549
T from_string(field const &value)
Convert a field's value to type T.
Definition field.hxx:520
format
Format code: is data text or binary?
Definition types.hxx:81
Internal items for libpqxx' own use. Do not use these yourself.
Definition composite.hxx:84
std::string demangle_type_name(char const[])
Attempt to demangle std::type_info::name() to something human-readable.
Definition strconv.cxx:230
Traits describing a type's "null value," if any.
Definition strconv.hxx:93
static bool is_null(TYPE const &value)
Is value a null?
static TYPE null()
Return a null value.
static bool has_null
Does this type have a null value?
Definition strconv.hxx:95
static bool always_null
Is this type always null?
Definition strconv.hxx:98
Nullness traits describing a type which does not have a null value.
Definition strconv.hxx:115
static constexpr bool always_null
Are all values of this type null?
Definition strconv.hxx:133
static constexpr bool has_null
Does TYPE have a "built-in null value"?
Definition strconv.hxx:127
static constexpr bool is_null(TYPE const &) noexcept
Does a given value correspond to an SQL null value?
Definition strconv.hxx:140
Traits class for use in string conversions.
Definition strconv.hxx:155
static std::size_t size_buffer(TYPE const &value) noexcept
Estimate how much buffer space is needed to represent value.
static zview to_buf(char *begin, char *end, TYPE const &value)
Return a string_view representing value, plus terminating zero.
static TYPE from_string(std::string_view text)
Parse a string representation of a TYPE value.
Definition strconv.cxx:740
static constexpr bool converts_to_string
Is conversion from TYPE to strings supported?
Definition strconv.hxx:160
static char * into_buf(char *begin, char *end, TYPE const &value)
Write value's string representation into buffer at begin.
static constexpr bool converts_from_string
Is conversion from string_view to TYPE supported?
Definition strconv.hxx:166
String traits for a forbidden type conversion.
Definition strconv.hxx:249
static char * into_buf(char *, char *, TYPE const &)
Definition strconv.hxx:256
static TYPE from_string(std::string_view)
Definition strconv.hxx:260
static std::size_t size_buffer(TYPE const &) noexcept
Definition strconv.hxx:264
static zview to_buf(char *, char *, TYPE const &)
Definition strconv.hxx:252
Helper class for defining enum conversions.
Definition strconv.hxx:365
static std::size_t size_buffer(ENUM const &value) noexcept
Definition strconv.hxx:388
static constexpr zview to_buf(char *begin, char *end, ENUM const &value)
Definition strconv.hxx:373
static constexpr bool converts_from_string
Definition strconv.hxx:370
std::underlying_type_t< ENUM > impl_type
Definition strconv.hxx:366
static ENUM from_string(std::string_view text)
Definition strconv.hxx:383
static constexpr char * into_buf(char *begin, char *end, ENUM const &value)
Definition strconv.hxx:378
static constexpr bool converts_to_string
Definition strconv.hxx:369
Marker-type wrapper: zero-terminated std::string_view.
Definition zview.hxx:38