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How do you declare an interface in C++?
...do I setup a class that represents an interface? Is this just an abstract base class?
15 Answers
...
Double vs. BigDecimal?
...g with prices you want to use BigDecimal. And if you store them in the database you want something similar.
– extraneon
Aug 5 '10 at 11:46
106
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Ruby optional parameters
... attributes to methods. The closest you can get is to pass nil:
ldap_get(base_dn, filter, nil, X)
However, this will set the scope to nil, not LDAP::LDAP_SCOPE_SUBTREE.
What you can do is set the default value within your method:
def ldap_get(base_dn, filter, scope = nil, attrs = nil)
scope ...
How to reset a single table in rails?
...index/primary key in SQLite just type:
$ rails console
> ActiveRecord::Base.connection.execute("DELETE from sqlite_sequence where name = 'yourtablename'")
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Set Locale programmatically
...ocale change in higher API versions. If so, add the following code to your Base Activity so that you update the context locale on every Activity creation:
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(updateBaseContextLocale(base));
}
private Context updat...
correct way to use super (argument passing)
...pairs off of **kwargs or remove them from *args. Instead, you can define a Base class which unlike object, absorbs/ignores arguments:
class Base(object):
def __init__(self, *args, **kwargs): pass
class A(Base):
def __init__(self, *args, **kwargs):
print "A"
super(A, self)._...
Simple way to encode a string according to a password?
...igenère cipher
It's quick and easy to implement. Something like:
import base64
def encode(key, string):
encoded_chars = []
for i in xrange(len(string)):
key_c = key[i % len(key)]
encoded_c = chr(ord(string[i]) + ord(key_c) % 256)
encoded_chars.append(encoded_c)
...
Load RSA public key from file
...eys.
The der format can be obtained but saving raw data ( without encoding base64).
I hope this helps programmers.
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStr...
Should you ever use protected member variables?
...
@Jake: You should never make design decisions based on performance assumptions. You make design decisions based upon what you think is the best design and only if you real life profiling shows a bottleneck in your design, you go and fix it. Usually if the design is sound...
C++ Dynamic Shared Library on Linux
... class_user
If this were for a plugin system, you would use MyClass as a base class and define all the required functions virtual. The plugin author would then derive from MyClass, override the virtuals and implement create_object and destroy_object. Your main application would not need to be chan...