In the code below, static_assert operates on the addresses of local variables, but however MS compiles it and the assertion does not fail:
#include <tuple>
#include <string>
struct A
{
int a;
double b;
std::string c;
};
void f()
{
A a{ 1, 3.0, "abc" };
constexpr auto t1 = std::tie(a.a, a.b, a.c);
static_assert(&std::get<0>(t1) == &a.a);
}
Use the following command to compile this example:
cl /std:c++17 /EHsc a.cpp
I created an unlockable product in Google Play, added billing permission to the manifest:
<uses-permission android:name="com.android.vending.BILLING"/>
and implemented billing in my application, but when I attempted to purchase the product first time I got error ‘This version of the application is not configured for billing through Google Play‘:
Consider the following scenario: there was structure A in an old version of a C++ application:
struct A
{
double a;
int b;
std::string c;
};
An instance of A was serialized into a file in a binary format and after that the application was updated to a new version.
But in the new version of the application structure A was modified by adding fields d and e and deleting field a:
struct A
{
int b;
std::vector<int> d;
bool e;
std::string c;
};
and the new version of the application needs to deserialize an instance of its new structure A from the file containing old version of A.
(more…)To set up an Oracle Database for development I install the database in a docker container and then modify password policies in the default user profile as follows:
ALTER PROFILE DEFAULT LIMIT COMPOSITE_LIMIT UNLIMITED
PASSWORD_LIFE_TIME UNLIMITED
PASSWORD_REUSE_TIME UNLIMITED
PASSWORD_REUSE_MAX UNLIMITED
PASSWORD_VERIFY_FUNCTION NULL
PASSWORD_LOCK_TIME UNLIMITED
PASSWORD_GRACE_TIME UNLIMITED
FAILED_LOGIN_ATTEMPTS UNLIMITED;
this prevents passwords from expiring and users from being locked.
(more…)I implemented a simple C++ binary serialization framework that makes a structure or class serializable by adding a macro that usually takes one line of code as shown in the example below:
struct A
{
bool x;
int y;
AWL_SERIALIZABLE(x, y)
};
There is also a macro that makes a structure or a class equatable:
AWL_MEMBERWISE_EQUATABLE(A)
First I installed Oracle 19c in Docker container , enabled unified auditing, and created multiple pluggable databases:
export ORACLE_SID=ORCLCDB
cd $ORACLE_HOME/bin
#connect to root container
./sqlplus / as sysdba
CREATE PLUGGABLE DATABASE testpdb1 ADMIN USER admin1 IDENTIFIED BY dbpasswd1
FILE_NAME_CONVERT=('/opt/oracle/oradata/ORCLCDB/pdbseed', '/opt/oracle/oradata/ORCLCDB/testpdb1');
Pluggable database created.
CREATE PLUGGABLE DATABASE testpdb2 ADMIN USER admin2 IDENTIFIED BY dbpasswd2
FILE_NAME_CONVERT=('/opt/oracle/oradata/ORCLCDB/pdbseed', '/opt/oracle/oradata/ORCLCDB/testpdb2');
Pluggable database created.
First I installed Ubuntu Server 18.04 as a Hyper-V machine on Windows 10.
While creating the virtual machine I selected Generation 1, because Generation 2 resulted in some strange effects.
Then I created a separate user with sudo permission:
sudo useradd -d /home/singh -m --shell "/bin/bash" singh
sudo passwd singh
sudo usermod -aG sudo singh
I configured DNS on my Windows Server 2016 (takes some time, probably 15 minutes):
ipconfig /registerdns
