libpqxx
5.0
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Iterator for rows in a result. Use as result::const_iterator. More...
#include <result.hxx>
Public Types | |
typedef const row * | pointer |
typedef row | reference |
typedef result::size_type | size_type |
typedef result::difference_type | difference_type |
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typedef row_size_type | size_type |
typedef row_difference_type | difference_type |
typedef const_row_iterator | const_iterator |
typedef const_iterator | iterator |
typedef field | reference |
typedef const_row_iterator | pointer |
typedef const_reverse_row_iterator | const_reverse_iterator |
typedef const_reverse_iterator | reverse_iterator |
Public Member Functions | |
const_result_iterator () PQXX_NOEXCEPT | |
const_result_iterator (const row &t) PQXX_NOEXCEPT | |
Dereferencing operators | |
pointer | operator-> () const |
reference | operator* () const |
Manipulations | |
const_result_iterator | operator++ (int) |
const_result_iterator & | operator++ () |
const_result_iterator | operator-- (int) |
const_result_iterator & | operator-- () |
const_result_iterator & | operator+= (difference_type i) |
const_result_iterator & | operator-= (difference_type i) |
Comparisons | |
bool | operator== (const const_result_iterator &i) const |
bool | operator!= (const const_result_iterator &i) const |
bool | operator< (const const_result_iterator &i) const |
bool | operator<= (const const_result_iterator &i) const |
bool | operator> (const const_result_iterator &i) const |
bool | operator>= (const const_result_iterator &i) const |
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row (const result *r, size_t i) PQXX_NOEXCEPT | |
~row () PQXX_NOEXCEPT | |
const_iterator | begin () const PQXX_NOEXCEPT |
const_iterator | cbegin () const PQXX_NOEXCEPT |
const_iterator | end () const PQXX_NOEXCEPT |
const_iterator | cend () const PQXX_NOEXCEPT |
size_type | size () const PQXX_NOEXCEPT |
void | swap (row &) PQXX_NOEXCEPT |
size_t | rownumber () const PQXX_NOEXCEPT |
size_t | num () const |
row | slice (size_type Begin, size_type End) const |
PQXX_PURE bool | empty () const PQXX_NOEXCEPT |
PQXX_PURE bool | operator== (const row &) const PQXX_NOEXCEPT |
bool | operator!= (const row &rhs) const PQXX_NOEXCEPT |
reference | front () const PQXX_NOEXCEPT |
reference | back () const PQXX_NOEXCEPT |
const_reverse_row_iterator | rbegin () const |
const_reverse_row_iterator | crbegin () const |
const_reverse_row_iterator | rend () const |
const_reverse_row_iterator | crend () const |
reference | operator[] (size_type) const PQXX_NOEXCEPT |
reference | operator[] (int) const PQXX_NOEXCEPT |
reference | operator[] (const char[]) const |
reference | operator[] (const std::string &) const |
reference | at (size_type) const |
reference | at (int) const |
reference | at (const char[]) const |
reference | at (const std::string &) const |
size_type | column_number (const std::string &ColName) const |
Number of given column (throws exception if it doesn't exist) More... | |
size_type | column_number (const char[]) const |
Number of given column (throws exception if it doesn't exist) More... | |
oid | column_type (size_type) const |
Type of given column. More... | |
oid | column_type (int ColNum) const |
Type of given column. More... | |
oid | column_type (const std::string &ColName) const |
Type of given column. More... | |
oid | column_type (const char ColName[]) const |
Type of given column. More... | |
oid | column_table (size_type ColNum) const |
What table did this column come from? More... | |
oid | column_table (int ColNum) const |
What table did this column come from? More... | |
oid | column_table (const std::string &ColName) const |
What table did this column come from? More... | |
size_type | table_column (size_type) const |
What column number in its table did this result column come from? More... | |
size_type | table_column (int ColNum) const |
What column number in its table did this result column come from? More... | |
size_type | table_column (const std::string &ColName) const |
What column number in its table did this result column come from? More... | |
Friends | |
class | pqxx::result |
Arithmetic operators | |
const_result_iterator | operator+ (difference_type, const_result_iterator) |
const_result_iterator | operator+ (difference_type) const |
const_result_iterator | operator- (difference_type) const |
difference_type | operator- (const_result_iterator) const |
Additional Inherited Members | |
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const result * | m_Home |
size_t | m_Index |
size_type | m_Begin |
size_type | m_End |
Iterator for rows in a result. Use as result::const_iterator.
A result, once obtained, cannot be modified. Therefore there is no plain iterator type for result. However its const_iterator type can be used to inspect its rows without changing them.
typedef const row* pqxx::const_result_iterator::pointer |
pqxx::const_result_iterator::const_result_iterator | ( | ) |
pqxx::const_result_iterator::const_result_iterator | ( | const row & | t | ) |
bool pqxx::const_result_iterator::operator!= | ( | const const_result_iterator & | i | ) | const |
reference pqxx::const_result_iterator::operator* | ( | ) | const |
const_result_iterator pqxx::const_result_iterator::operator+ | ( | result::difference_type | o | ) | const |
pqxx::const_result_iterator pqxx::const_result_iterator::operator++ | ( | int | ) |
const_result_iterator& pqxx::const_result_iterator::operator++ | ( | ) |
const_result_iterator& pqxx::const_result_iterator::operator+= | ( | difference_type | i | ) |
const_result_iterator pqxx::const_result_iterator::operator- | ( | result::difference_type | o | ) | const |
result::difference_type pqxx::const_result_iterator::operator- | ( | const_result_iterator | i | ) | const |
References pqxx::row::num().
pqxx::const_result_iterator pqxx::const_result_iterator::operator-- | ( | int | ) |
const_result_iterator& pqxx::const_result_iterator::operator-- | ( | ) |
const_result_iterator& pqxx::const_result_iterator::operator-= | ( | difference_type | i | ) |
pointer pqxx::const_result_iterator::operator-> | ( | ) | const |
The iterator "points to" its own row, which is also itself. This allows a result to be addressed as a two-dimensional container without going through the intermediate step of dereferencing the iterator. I hope this works out to be similar to C pointer/array semantics in useful cases.
IIRC Alex Stepanov, the inventor of the STL, once remarked that having this as standard behaviour for pointers would be useful in some algorithms. So even if this makes me look foolish, I would seem to be in distinguished company.
bool pqxx::const_result_iterator::operator< | ( | const const_result_iterator & | i | ) | const |
bool pqxx::const_result_iterator::operator<= | ( | const const_result_iterator & | i | ) | const |
bool pqxx::const_result_iterator::operator== | ( | const const_result_iterator & | i | ) | const |
bool pqxx::const_result_iterator::operator> | ( | const const_result_iterator & | i | ) | const |
bool pqxx::const_result_iterator::operator>= | ( | const const_result_iterator & | i | ) | const |
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