Resource class for MDB_txn*
handles.
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#include <lmdb++.h>
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| txn (MDB_txn *const handle) noexcept |
| Constructor.
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| txn (txn &&other) noexcept |
| Move constructor.
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txn & | operator= (txn &&other) noexcept |
| Move assignment operator.
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| ~txn () noexcept |
| Destructor.
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| operator MDB_txn * () const noexcept |
| Returns the underlying MDB_txn* handle.
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MDB_txn * | handle () const noexcept |
| Returns the underlying MDB_txn* handle.
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MDB_env * | env () const noexcept |
| Returns the transaction's MDB_env* handle.
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void | commit () |
| Commits this transaction.
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void | abort () noexcept |
| Aborts this transaction.
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void | reset () noexcept |
| Resets this read-only transaction.
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void | renew () |
| Renews this read-only transaction.
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static txn | begin (MDB_env *const env, MDB_txn *const parent=nullptr, const unsigned int flags=default_flags) |
| Creates a new LMDB transaction.
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Resource class for MDB_txn*
handles.
- Note
- Instances of this class are movable, but not copyable.
- See also
- http://symas.com/mdb/doc/group__internal.html#structMDB__txn
◆ txn() [1/2]
lmdb::txn::txn |
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MDB_txn *const | handle | ) |
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inlinenoexcept |
Constructor.
- Parameters
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handle | a valid MDB_txn* handle |
◆ txn() [2/2]
lmdb::txn::txn |
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txn && | other | ) |
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inlinenoexcept |
◆ ~txn()
◆ abort()
void lmdb::txn::abort |
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inlinenoexcept |
Aborts this transaction.
- Postcondition
handle() == nullptr
◆ begin()
static txn lmdb::txn::begin |
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MDB_env *const | env, |
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MDB_txn *const | parent = nullptr, |
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const unsigned int | flags = default_flags ) |
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inlinestatic |
Creates a new LMDB transaction.
- Parameters
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env | the environment handle |
parent | |
flags | |
- Exceptions
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◆ commit()
void lmdb::txn::commit |
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inline |
Commits this transaction.
- Exceptions
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- Postcondition
handle() == nullptr
◆ env()
MDB_env * lmdb::txn::env |
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const |
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inlinenoexcept |
Returns the transaction's MDB_env*
handle.
◆ handle()
MDB_txn * lmdb::txn::handle |
( |
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const |
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inlinenoexcept |
Returns the underlying MDB_txn*
handle.
◆ operator MDB_txn *()
lmdb::txn::operator MDB_txn * |
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const |
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inlinenoexcept |
Returns the underlying MDB_txn*
handle.
◆ operator=()
txn & lmdb::txn::operator= |
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txn && | other | ) |
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inlinenoexcept |
Move assignment operator.
◆ renew()
void lmdb::txn::renew |
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inline |
Renews this read-only transaction.
- Exceptions
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◆ reset()
void lmdb::txn::reset |
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inlinenoexcept |
Resets this read-only transaction.
◆ _handle
MDB_txn* lmdb::txn::_handle {nullptr} |
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protected |
◆ default_flags
unsigned int lmdb::txn::default_flags = 0 |
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staticconstexpr |
The documentation for this class was generated from the following file: