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What's wrong with nullable columns in composite primary keys?
...kages have a customized extension that is usually not an integer (like "rc-foo" or "vanilla" or "beta" or whatever else someone for whom four fields is insufficient might dream up). If a package does not have an extension, then it is NULL in the above model, and no harm would be done by leaving thin...
How to get a reference to current module's attributes in Python
...e added for example, via hooking or by the 3dparty tools like pytest:
*** foo ... ..
*** boo ... ..
*** runtest c:\python\x86\37\lib\site-packages\xonsh\pytest_plugin.py 58
*** pytest_runtest_call c:\python\x86\37\lib\site-packages\_pytest\runner.py 125
*** _multicall c:\python\x86\37\lib\site-pack...
What are the differences between a pointer variable and a reference variable in C++?
...lass
{
...
virtual void DoSomething(int,int,int,int,int);
};
void Foo(const My
How can bcrypt have built-in salts?
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OK, so I sign up for a site and choose a the password "foo". Bcrypt adds a random salt of "akd2!*", resulting in "fooakd2!*", which is hashed and stored. Later, I try to sign in with password "bar". To see if I'm correct, it needs to hash "barakd2!*". If the salt was generated ra...
SPAN vs DIV (inline-block)
...an't put block elements inside inline elements so:
<p>...<div>foo</div>...</p>
is not strictly valid even if you change the <div> to inline or inline-block.
So, if your element is inline or inline-block use a <span>. If it's a block level element, use a <di...
Best way to represent a fraction in Java?
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How do I pass a variable by reference?
...will reassign the name to a new object whether it is immutable or not? def Foo(alist): alist = [1,2,3] will not modify the contents of the list from the callers perspective.
– Mark Ransom
Nov 15 '11 at 16:46
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How can I repeat a character in Bash?
...om the question is by far the fastest.
Bash's global string-replacement (${foo// /=}) is inexplicably excruciatingly slow with large strings, and has been taken out of the running (took around 50 minutes(!) in Bash 4.3.30, and even longer in Bash 3.2.57 - I never waited for it to finish).
Bash loops...
What's wrong with using $_REQUEST[]?
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if $_POST is a="foo" and $_COOKIE a="bar", then will there be any override/conflicts here?
– Rust
Jan 30 '17 at 6:54
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Templated check for the existence of a class member function?
...tring
// which takes no parameter and returns a std::string
constexpr bool foo = has_member_function_toString<T, std::string>::value;
Then, you could use the bool to create a SFINAE check.
Explanation
The macro BOOST_TTI_HAS_MEMBER_FUNCTION generates the metafunction has_member_function_toStr...