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C++0x lambda capture by value always const?
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167
Use mutable.
auto bar = [=] () mutable -> bool ....
Without mutable you are declaring t...
Setting a timeout for socket operations
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164
Use the Socket() constructor, and connect(SocketAddress endpoint, int timeout) method instead....
Is it possible to do start iterating from an element other than the first using foreach?
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162
Yes. Do the following:
Collection<string> myCollection = new Collection<string>;
...
PHP namespaces and “use”
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170
The use operator is for giving aliases to names of classes, interfaces or other namespaces. Mo...
Using try vs if in python
...surements:
>>> import timeit
>>> timeit.timeit(setup="a=1;b=1", stmt="a/b") # no error checking
0.06379691968322732
>>> timeit.timeit(setup="a=1;b=1", stmt="try:\n a/b\nexcept ZeroDivisionError:\n pass")
0.0829463709378615
>>> timeit.timeit(setup="a=1;b=0", stmt=...
Qt c++ aggregate 'std::stringstream ss' has incomplete type and cannot be defined
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155
You probably have a forward declaration of the class, but haven't included the header:
#inclu...
Multiple columns index when using the declarative ORM extension of sqlalchemy
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139
those are just Column objects, index=True flag works normally:
class A(Base):
__tablename...
encryption/decryption with multiple keys
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174
GnuPG does multi-key encryption in standard.
The following command will encrypt doc.txt using...
What does “abstract over” mean?
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124
In algebra, as in everyday concept formation, abstractions are formed by grouping things by so...
How do you do natural logs (e.g. “ln()”) with numpy in Python?
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156
np.log is ln, whereas np.log10 is your standard base 10 log.
Relevant documentation:
http://...