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PATH: usr / include / mysql / server / private

/*
   Copyright (c) 2020, MariaDB

This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU General Public License for more details.

You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA
*/

#pragma once

#include <type_traits>
#include <utility>

namespace detail
{

template <typename Callable> class scope_exit
{
public:
  template <typename F>
  explicit scope_exit(F &&f) : function_(std::forward<F>(f))
  {
  }

template <typename F>
  scope_exit(F &&f, bool engaged) : function_(std::forward<F>(f)), engaged_(engaged)
  {
  }

scope_exit(scope_exit &&rhs)
      : function_(std::move(rhs.function_)), engaged_(rhs.engaged_)
  {
    rhs.release();
  }

scope_exit(const scope_exit &)= delete;
  scope_exit &operator=(scope_exit &&)= delete;
  scope_exit &operator=(const scope_exit &)= delete;

void release() { engaged_= false; }
  void engage() { DBUG_ASSERT(!engaged_); engaged_= true; }

~scope_exit()
  {
    if (engaged_)
      function_();
  }

private:
  Callable function_;
  bool engaged_= true;
};

} // end namespace detail

template <typename Callable>
inline
::detail::scope_exit<typename std::decay<Callable>::type>
make_scope_exit(Callable &&f, bool engaged= true)
{
  return ::detail::scope_exit<typename std::decay<Callable>::type>(
      std::forward<Callable>(f), engaged);
}

#define CONCAT_IMPL(x, y) x##y
#define CONCAT(x, y) CONCAT_IMPL(x, y)
#define ANONYMOUS_VARIABLE CONCAT(_anonymous_variable, __LINE__)

#define SCOPE_EXIT auto ANONYMOUS_VARIABLE= make_scope_exit

#define IF_CLASS(C) typename std::enable_if<std::is_class<C>::value>::type
#define IF_NOT_CLASS(C) typename std::enable_if<!std::is_class<C>::value>::type

namespace detail
{

template <typename T>
class Scope_value
{
public:
  // Use SFINAE for passing structs by reference and plain types by value.
  // This ctor is defined only if T is a class or struct:
  template <typename U = T, typename = IF_CLASS(U)>
  Scope_value(T &variable, const T &scope_value)
      : variable_(&variable), saved_value_(variable)
  {
    variable= scope_value;
  }

// This ctor is defined only if T is NOT a class or struct:
  template <typename U = T, typename = IF_NOT_CLASS(U)>
  Scope_value(T &variable, const T scope_value)
      : variable_(&variable), saved_value_(variable)
  {
    variable= scope_value;
  }

Scope_value(Scope_value &&rhs)
      : variable_(rhs.variable_), saved_value_(rhs.saved_value_)
  {
    rhs.variable_= NULL;
  }

Scope_value(const Scope_value &)= delete;
  Scope_value &operator=(const Scope_value &)= delete;
  Scope_value &operator=(Scope_value &&)= delete;

~Scope_value()
  {
    if (variable_)
      *variable_= saved_value_;
  }

private:
  T *variable_;
  T saved_value_;
};

} // namespace detail

// Use like this:
// auto _= make_scope_value(var, tmp_value);

template <typename T, typename = IF_CLASS(T)>
inline
::detail::Scope_value<T> make_scope_value(T &variable, const T &scope_value)
{
  return ::detail::Scope_value<T>(variable, scope_value);
}

template <typename T, typename = IF_NOT_CLASS(T)>
inline
::detail::Scope_value<T> make_scope_value(T &variable, T scope_value)
{
  return ::detail::Scope_value<T>(variable, scope_value);
}

/*
  Note: perfect forwarding version can not pass const:

template <typename T, typename U>
  inline
  detail::Scope_value<T> make_scope_value(T &variable, U &&scope_value)
  {
      return detail::Scope_value<T>(variable, std::forward<U>(scope_value));
  }

as `const U &&` fails with error `expects an rvalue for 2nd argument`. That
  happens because const U && is treated as rvalue only (this is the exact syntax
  for declaring rvalues).
*/

#define SCOPE_VALUE auto ANONYMOUS_VARIABLE= make_scope_value
#define SCOPE_SET(VAR, MASK) auto ANONYMOUS_VARIABLE= make_scope_value(VAR, VAR | MASK)
#define SCOPE_CLEAR(VAR, MASK) auto ANONYMOUS_VARIABLE= make_scope_value(VAR, VAR & ~MASK)

[+] ..
[-] sp_head.h [edit]
[-] lf.h [edit]
[-] sql_type_json.h [edit]
[-] field.h [edit]
[+] providers
[-] sql_schema.h [edit]
[-] rpl_filter.h [edit]
[-] item_jsonfunc.h [edit]
[-] my_json_writer.h [edit]
[-] service_versions.h [edit]
[-] mdl.h [edit]
[-] wsrep_utils.h [edit]
[-] my_rdtsc.h [edit]
[-] item_xmlfunc.h [edit]
[-] myisamchk.h [edit]
[-] wsrep.h [edit]
[-] sql_basic_types.h [edit]
[-] wsrep_high_priority_service.h [edit]
[-] wsrep_event_service.h [edit]
[-] sql_digest.h [edit]
[-] sql_analyze_stmt.h [edit]
[-] my_rnd.h [edit]
[-] proxy_protocol.h [edit]
[-] field_comp.h [edit]
[-] pfs_socket_provider.h [edit]
[-] my_virtual_mem.h [edit]
[-] unireg.h [edit]
[-] charset_collations.h [edit]
[-] sql_insert.h [edit]
[-] embedded_priv.h [edit]
[-] rpl_reporting.h [edit]
[-] authors.h [edit]
[-] sql_type_fixedbin.h [edit]
[-] sql_profile.h [edit]
[-] pfs_stage_provider.h [edit]
[-] sql_error.h [edit]
[-] sql_udf.h [edit]
[-] sp_pcontext.h [edit]
[-] lex_token.h [edit]
[-] sql_partition_admin.h [edit]
[-] uniques.h [edit]
[-] sql_audit.h [edit]
[-] sql_connect.h [edit]
[-] privilege.h [edit]
[-] tztime.h [edit]
[-] sql_type_fixedbin_storage.h [edit]
[-] wsrep_thd.h [edit]
[-] probes_mysql_dtrace.h [edit]
[-] pfs_thread_provider.h [edit]
[-] spatial.h [edit]
[+] atomic
[-] sql_manager.h [edit]
[-] sql_string.h [edit]
[-] my_service_manager.h [edit]
[-] sp_instr.h [edit]
[-] filesort.h [edit]
[-] backup.h [edit]
[-] sql_lifo_buffer.h [edit]
[-] debug_sync.h [edit]
[-] sql_type_int.h [edit]
[-] scope.h [edit]
[-] probes_mysql_nodtrace.h [edit]
[-] rijndael.h [edit]
[-] rpl_record.h [edit]
[-] transaction.h [edit]
[-] sql_type_real.h [edit]
[-] wsrep_on.h [edit]
[-] my_compare.h [edit]
[-] ddl_log.h [edit]
[-] hostname.h [edit]
[-] datadict.h [edit]
[-] key.h [edit]
[-] protocol.h [edit]
[-] config.h [edit]
[-] my_tracker.h [edit]
[-] threadpool_winsockets.h [edit]
[-] mysys_err.h [edit]
[-] ha_partition.h [edit]
[-] sql_plugin.h [edit]
[-] sql_rename.h [edit]
[-] sql_table.h [edit]
[-] sql_select.h [edit]
[-] rpl_parallel.h [edit]
[-] wsrep_priv.h [edit]
[-] my_md5.h [edit]
[-] wsrep_storage_service.h [edit]
[-] procedure.h [edit]
[-] my_nosys.h [edit]
[-] lex.h [edit]
[-] lex_hash.h [edit]
[-] wsrep_xid.h [edit]
[-] thr_timer.h [edit]
[-] sql_i_s.h [edit]
[-] pfs_file_provider.h [edit]
[-] wsrep_mysqld.h [edit]
[-] pfs_memory_provider.h [edit]
[-] myisammrg.h [edit]
[-] sql_bitmap.h [edit]
[-] wsrep_var.h [edit]
[-] sql_view.h [edit]
[-] sql_const.h [edit]
[-] log_slow.h [edit]
[-] sql_tvc.h [edit]
[-] hash_filo.h [edit]
[-] create_options.h [edit]
[-] sql_crypt.h [edit]
[-] mem_root_array.h [edit]
[-] item_windowfunc.h [edit]
[-] my_default.h [edit]
[-] event_data_objects.h [edit]
[-] wqueue.h [edit]
[-] wsrep_applier.h [edit]
[-] dur_prop.h [edit]
[-] lex_symbol.h [edit]
[-] wsrep_mysqld_c.h [edit]
[-] sql_get_diagnostics.h [edit]
[-] wsrep_mutex.h [edit]
[-] contributors.h [edit]
[-] queues.h [edit]
[-] event_db_repository.h [edit]
[-] waiting_threads.h [edit]
[-] ft_global.h [edit]
[-] multi_range_read.h [edit]
[-] events.h [edit]
[-] sql_parse.h [edit]
[-] sql_reload.h [edit]
[-] wsrep_condition_variable.h [edit]
[-] item_timefunc.h [edit]
[-] rpl_mi.h [edit]
[-] my_atomic.h [edit]
[-] my_atomic_wrapper.h [edit]
[-] welcome_copyright_notice.h [edit]
[-] sql_digest_stream.h [edit]
[-] parse_file.h [edit]
[-] opt_trace.h [edit]
[-] myisampack.h [edit]
[-] ha_sequence.h [edit]
[-] sql_explain.h [edit]
[-] simple_tokenizer.h [edit]
[-] slave.h [edit]
[-] sql_list.h [edit]
[-] aligned.h [edit]
[-] item_func.h [edit]
[-] opt_subselect.h [edit]
[-] rpl_constants.h [edit]
[-] sql_hset.h [edit]
[-] maria.h [edit]
[-] sql_join_cache.h [edit]
[-] sql_plugin_compat.h [edit]
[-] json_schema_helper.h [edit]
[-] span.h [edit]
[-] gstream.h [edit]
[-] my_bit.h [edit]
[-] sql_show.h [edit]
[-] thr_malloc.h [edit]
[-] vers_string.h [edit]
[-] sql_array.h [edit]
[-] threadpool_generic.h [edit]
[-] sp_cache.h [edit]
[-] records.h [edit]
[-] sql_do.h [edit]
[-] my_stacktrace.h [edit]
[-] opt_range.h [edit]
[-] keycaches.h [edit]
[-] mariadb.h [edit]
[-] deprecation.h [edit]
[-] sql_bootstrap.h [edit]
[-] scheduler.h [edit]
[-] my_libwrap.h [edit]
[-] compat56.h [edit]
[-] grant.h [edit]
[-] item_geofunc.h [edit]
[-] pfs_table_provider.h [edit]
[-] sql_help.h [edit]
[-] sql_derived.h [edit]
[-] hash.h [edit]
[-] rpl_utility.h [edit]
[-] my_stack_alloc.h [edit]
[-] my_apc.h [edit]
[-] sql_base.h [edit]
[-] item_cmpfunc.h [edit]
[-] discover.h [edit]
[-] item.h [edit]
[-] opt_rewrite_date_cmp.h [edit]
[-] json_table.h [edit]
[-] xa.h [edit]
[-] semisync_master_ack_receiver.h [edit]
[-] sql_truncate.h [edit]
[-] winservice.h [edit]
[-] wsrep_types.h [edit]
[-] gtid_index.h [edit]
[-] rpl_tblmap.h [edit]
[-] item_row.h [edit]
[-] sql_limit.h [edit]
[-] rpl_injector.h [edit]
[-] item_vers.h [edit]
[-] event_parse_data.h [edit]
[-] my_user.h [edit]
[-] password.h [edit]
[-] sql_servers.h [edit]
[-] aria_backup.h [edit]
[-] wsrep_binlog.h [edit]
[-] filesort_utils.h [edit]
[-] sql_alloc.h [edit]
[-] des_key_file.h [edit]
[-] sp.h [edit]
[-] derror.h [edit]
[-] heap.h [edit]
[-] ha_handler_stats.h [edit]
[-] sql_load.h [edit]
[-] handle_connections_win.h [edit]
[-] item_strfunc.h [edit]
[-] wsrep_server_state.h [edit]
[-] rpl_gtid.h [edit]
[-] sql_time.h [edit]
[-] log_cache.h [edit]
[-] sql_analyse.h [edit]
[-] wsrep_server_service.h [edit]
[-] strfunc.h [edit]
[-] sql_locale.h [edit]
[-] lex_string.h [edit]
[-] sys_vars_shared.h [edit]
[-] lex_charset.h [edit]
[-] sql_partition.h [edit]
[-] rpl_rli.h [edit]
[-] thr_lock.h [edit]
[-] sql_prepare.h [edit]
[-] select_handler.h [edit]
[-] handler.h [edit]
[-] sql_cursor.h [edit]
[-] probes_mysql.h [edit]
[-] sql_statistics.h [edit]
[-] sql_repl.h [edit]
[-] source_revision.h [edit]
[-] sql_class.h [edit]
[-] opt_histogram_json.h [edit]
[-] derived_handler.h [edit]
[-] sql_type.h [edit]
[-] my_handler_errors.h [edit]
[-] sql_cache.h [edit]
[-] sql_delete.h [edit]
[-] mysqld_default_groups.h [edit]
[-] sql_admin.h [edit]
[-] wsrep_trans_observer.h [edit]
[-] cset_narrowing.h [edit]
[-] log_event.h [edit]
[-] optimizer_costs.h [edit]
[-] item_subselect.h [edit]
[-] my_uctype.h [edit]
[-] ilist.h [edit]
[-] sql_handler.h [edit]
[-] sql_plist.h [edit]
[-] group_by_handler.h [edit]
[-] sql_expression_cache.h [edit]
[-] item_sum.h [edit]
[-] thread_cache.h [edit]
[-] json_schema.h [edit]
[-] sql_alter.h [edit]
[-] lex_ident.h [edit]
[-] wsrep_status.h [edit]
[-] assume_aligned.h [edit]
[-] threadpool.h [edit]
[-] my_time.h [edit]
[-] sql_type_geom.h [edit]
[-] event_queue.h [edit]
[-] repl_failsafe.h [edit]
[-] ssl_compat.h [edit]
[-] sql_type_string.h [edit]
[-] debug.h [edit]
[-] sql_db.h [edit]
[+] data
[-] t_ctype.h [edit]
[-] sql_test.h [edit]
[-] wsrep_schema.h [edit]
[-] wsrep_client_service.h [edit]
[-] sql_binlog.h [edit]
[-] session_tracker.h [edit]
[-] my_cpu.h [edit]
[-] sql_type_timeofday.h [edit]
[-] my_bitmap.h [edit]
[-] sp_rcontext.h [edit]
[-] wsrep_plugin.h [edit]
[-] sql_sequence.h [edit]
[-] sql_trigger.h [edit]
[-] log.h [edit]
[-] semisync_slave.h [edit]
[-] sql_debug.h [edit]
[-] optimizer_defaults.h [edit]
[-] event_scheduler.h [edit]
[-] set_var.h [edit]
[-] pfs_idle_provider.h [edit]
[-] mysqld.h [edit]
[-] sql_used.h [edit]
[-] sql_callback.h [edit]
[-] gcalc_slicescan.h [edit]
[-] tzfile.h [edit]
[-] sql_union.h [edit]
[-] wsrep_sst.h [edit]
[-] gcalc_tools.h [edit]
[-] opt_trace_context.h [edit]
[-] semisync.h [edit]
[-] pfs_transaction_provider.h [edit]
[-] sql_acl.h [edit]
[-] create_tmp_table.h [edit]
[-] rowid_filter.h [edit]
[-] my_decimal.h [edit]
[-] char_buffer.h [edit]
[-] custom_conf.h [edit]
[-] mysqld_suffix.h [edit]
[-] message.h [edit]
[-] init.h [edit]
[-] structs.h [edit]
[-] replication.h [edit]
[-] semisync_master.h [edit]
[-] sql_update.h [edit]
[-] my_minidump.h [edit]
[-] sql_mode.h [edit]
[-] sql_signal.h [edit]
[-] wsrep_client_state.h [edit]
[-] innodb_priv.h [edit]
[-] lock.h [edit]
[-] bounded_queue.h [edit]
[-] log_event_data_type.h [edit]
[-] socketpair.h [edit]
[-] sql_cte.h [edit]
[-] table_cache.h [edit]
[-] partition_element.h [edit]
[-] violite.h [edit]
[-] sql_cmd.h [edit]
[-] my_tree.h [edit]
[-] pfs_statement_provider.h [edit]
[-] wsrep_allowlist_service.h [edit]
[-] pfs_metadata_provider.h [edit]
[-] item_create.h [edit]
[-] my_crypt.h [edit]
[-] sql_sort.h [edit]
[-] my_counter.h [edit]
[-] myisam.h [edit]
[-] sql_priv.h [edit]
[-] sql_window.h [edit]
[-] my_check_opt.h [edit]
[-] sql_lex.h [edit]
[-] client_settings.h [edit]
[-] table.h [edit]
[-] my_base.h [edit]
[-] partition_info.h [edit]