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static zview | to_buf (char *begin, char *end, pqxx::internal::encoding_group const &value) |
| Return a string_view representing value, plus terminating zero.
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static char * | into_buf (char *begin, char *end, pqxx::internal::encoding_group const &value) |
| Write value's string representation into buffer at begin .
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static pqxx::internal::encoding_group | from_string (std::string_view text) |
| Parse a string representation of a TYPE value.
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static std::size_t | size_buffer (pqxx::internal::encoding_group const &value) noexcept |
| Estimate how much buffer space is needed to represent value.
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static constexpr zview | to_buf (char *begin, char *end, pqxx::internal::encoding_group const &value) |
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static constexpr char * | into_buf (char *begin, char *end, pqxx::internal::encoding_group const &value) |
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static pqxx::internal::encoding_group | from_string (std::string_view text) |
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static std::size_t | size_buffer (pqxx::internal::encoding_group const &value) noexcept |
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static constexpr bool | converts_to_string |
| Is conversion from TYPE to strings supported?
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static constexpr bool | converts_from_string |
| Is conversion from string_view to TYPE supported?
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static constexpr bool | converts_to_string |
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static constexpr bool | converts_from_string |
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using | impl_type |
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using | impl_traits |
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◆ from_string()
static pqxx::internal::encoding_group pqxx::string_traits< pqxx::internal::encoding_group >::from_string |
( |
std::string_view | text | ) |
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inlinestaticnodiscard |
Parse a string representation of a TYPE
value.
Throws conversion_error
if value
does not meet the expected format for a value of this type.
- Warning
- A null value has no string representation. Do not parse a null.
◆ size_buffer()
static std::size_t pqxx::string_traits< pqxx::internal::encoding_group >::size_buffer |
( |
pqxx::internal::encoding_group const & | value | ) |
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inlinestaticnodiscardnoexcept |
Estimate how much buffer space is needed to represent value.
The estimate may be a little pessimistic, if it saves time.
The estimate includes the terminating zero.
◆ to_buf()
static zview pqxx::string_traits< pqxx::internal::encoding_group >::to_buf |
( |
char * | begin, |
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char * | end, |
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pqxx::internal::encoding_group const & | value ) |
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inlinestaticnodiscard |
Return a string_view
representing value, plus terminating zero.
Produces a string_view
containing the PostgreSQL string representation for value
.
- Warning
- A null value has no string representation. Do not pass a null.
Uses the space from begin
to end
as a buffer, if needed. The returned string may lie somewhere in that buffer, or it may be a compile-time constant, or it may be null if value was a null value. Even if the string is stored in the buffer, its begin()
may or may not be the same as begin
.
The string_view
is guaranteed to be valid as long as the buffer from begin
to end
remains accessible and unmodified.
- Exceptions
-
pqxx::conversion_overrun | if the provided buffer space may not be enough. For maximum performance, this is a conservative estimate. It may complain about a buffer which is actually large enough for your value, if an exact check gets too expensive. |
◆ converts_from_string
Is conversion from string_view
to TYPE
supported?
When defining your own conversions, specialise this as true
to indicate that your string traits support from_string
.
◆ converts_to_string
Is conversion from TYPE
to strings supported?
When defining your own conversions, specialise this as true
to indicate that your string traits support the conversions to strings.
The documentation for this struct was generated from the following file:
- /builddir/build/BUILD/libpqxx-7.10.0-build/libpqxx-7.10.0/redhat-linux-build/include/pqxx/internal/encodings.hxx