11 #ifndef PQXX_H_STRINGCONV
12 #define PQXX_H_STRINGCONV
14 #include "pqxx/compiler-public.hxx"
23 #if __has_include(<charconv>)
27 #include "pqxx/except.hxx"
28 #include "pqxx/util.hxx"
29 #include "pqxx/zview.hxx"
75 template<
typename TYPE>
86 template<
typename TYPE,
typename ENABLE =
void>
struct nullness
103 [[nodiscard]]
static TYPE
null();
112 [[nodiscard]]
static constexpr
bool is_null(TYPE
const &) noexcept
146 [[nodiscard]]
static inline zview
147 to_buf(
char *begin,
char *end, TYPE
const &value);
157 static inline char *
into_buf(
char *begin,
char *end, TYPE
const &value);
163 [[nodiscard]]
static inline TYPE
from_string(std::string_view text);
170 [[nodiscard]]
static inline std::size_t
176 template<
typename ENUM>
199 [[nodiscard]]
static constexpr
zview
200 to_buf(
char *begin,
char *end, ENUM
const &value)
205 static constexpr
char *
into_buf(
char *begin,
char *end, ENUM
const &value)
215 [[nodiscard]]
static std::size_t
size_buffer(ENUM
const &value) noexcept
235 #define PQXX_DECLARE_ENUM_CONVERSION(ENUM) \
236 template<> struct string_traits<ENUM> : pqxx::internal::enum_traits<ENUM> \
238 template<> inline std::string const type_name<ENUM> { #ENUM }
256 template<
typename TYPE>
271 [[nodiscard]]
inline std::string_view
from_string(std::string_view text)
285 template<
typename T>
inline void from_string(std::string_view text, T &value)
287 value = from_string<T>(text);
297 template<
typename TYPE>
inline std::string
to_string(TYPE
const &value);
308 template<
typename... TYPE>
309 [[nodiscard]]
inline std::vector<std::string_view>
310 to_buf(
char *here,
char const *end, TYPE... value)
312 return std::vector<std::string_view>{[&here, end](
auto v) {
316 auto len{
static_cast<std::size_t
>(here - begin) - 1};
317 return std::string_view{begin, len};
325 template<
typename TYPE>
330 template<
typename TYPE>
331 [[nodiscard]]
inline bool is_null(TYPE
const &value) noexcept
341 template<
typename... TYPE>
342 [[nodiscard]]
inline std::size_t
size_buffer(TYPE
const &...value) noexcept
380 #include "pqxx/internal/conversions.hxx"
static ENUM from_string(std::string_view text)
Definition: strconv.hxx:210
std::string demangle_type_name(char const[])
Attempt to demangle std::type_info::name() to something human-readable.
Definition: strconv.cxx:222
std::string const type_name
A human-readable name for a type, used in error messages and such.
Definition: strconv.hxx:76
std::string to_string_float(T value)
Floating-point implementations for pqxx::to_string().
Definition: strconv.cxx:639
std::underlying_type_t< ENUM > impl_type
Definition: strconv.hxx:196
Traits describing a type's "null value," if any.
Definition: strconv.hxx:87
Value conversion failed, e.g. when converting "Hello" to int.
Definition: except.hxx:179
The home of all libpqxx classes, functions, templates, etc.
Definition: array.hxx:26
static constexpr zview to_buf(char *begin, char *end, ENUM const &value)
Definition: strconv.hxx:200
bool is_null(TYPE const &value) noexcept
Is value null?
Definition: strconv.hxx:331
std::string to_string(field const &value)
Convert a field to a string.
Definition: result.cxx:499
encoding_group enc_group(int libpq_enc_id)
Definition: encodings.cxx:571
Helper class for defining enum conversions.
Definition: strconv.hxx:195
std::string state_buffer_overrun(int have_bytes, int need_bytes)
Definition: strconv.cxx:248
void throw_null_conversion(std::string const &type)
Definition: strconv.cxx:242
Internal items for libpqxx' own use. Do not use these yourself.
Definition: composite.hxx:74
std::vector< std::string_view > to_buf(char *here, char const *end, TYPE... value)
Convert multiple values to strings inside a single buffer.
Definition: strconv.hxx:310
Traits class for use in string conversions.
Definition: strconv.hxx:127
static TYPE from_string(std::string_view text)
Parse a string representation of a TYPE value.
Definition: strconv.cxx:717
static std::size_t size_buffer(ENUM const &value) noexcept
Definition: strconv.hxx:215
void into_string(TYPE const &value, std::string &out)
Convert a value to a readable string that PostgreSQL will understand.
static bool has_null
Does this type have a null value?
Definition: strconv.hxx:89
Nullness traits describing a type which does not have a null value.
Definition: strconv.hxx:109
Could not convert value to string: not enough buffer space.
Definition: except.hxx:186
static bool always_null
Is this type always null?
Definition: strconv.hxx:92
static constexpr bool always_null
Definition: strconv.hxx:111
constexpr char array_separator
Element separator between SQL array elements of this type.
Definition: strconv.hxx:375
std::string to_dumb_stringstream(dumb_stringstream< F > &s, F value)
Definition: strconv.cxx:629
static bool is_null(TYPE const &value)
Is value a null?
T from_string(field const &value)
Convert a field's value to type T.
Definition: field.hxx:487
static constexpr bool is_null(TYPE const &) noexcept
Definition: strconv.hxx:112
constexpr bool is_sql_array
Does this type translate to an SQL array?
Definition: strconv.hxx:355
std::size_t size_buffer(TYPE const &...value) noexcept
Estimate how much buffer space is needed to represent values as a string.
Definition: strconv.hxx:342
static constexpr bool has_null
Definition: strconv.hxx:110
static char * into_buf(char *begin, char *end, TYPE const &value)
Write value's string representation into buffer at begin.
Marker-type wrapper: zero-terminated std::string_view.
Definition: zview.hxx:38
static zview to_buf(char *begin, char *end, TYPE const &value)
Return a string_view representing value, plus terminating zero.
result_difference_type difference_type
Definition: cursor.hxx:44
static constexpr char * into_buf(char *begin, char *end, ENUM const &value)
Definition: strconv.hxx:205
Result set containing data returned by a query or command.
Definition: result.hxx:71
static std::size_t size_buffer(TYPE const &value) noexcept
Estimate how much buffer space is needed to represent value.
constexpr bool is_unquoted_safe
Can we use this type in arrays and composite types without quoting them?
Definition: strconv.hxx:371