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Copy constructor for a class with unique_ptr
...it has already been deleted and we will get some bad memory access runtime error (or undefined behavior if we are unlucky).
So, the right way is to either implement copy constructor and copy assignment operator, so that the behavior is clear and we can create a copy.
unique_ptr is way ahead of us ...
Python: print a generator expression?
...e(10)
Now, you can't stick that on a line by itself, you'll get a syntax error. But you can put parenthesis around it.
>>> (x*x for x in range(10))
<generator object <genexpr> at 0xb7485464>
This is sometimes called a generator comprehension, although I think the official n...
Can inner classes access private variables?
This errors out when I compile with class Outer::Inner' has no member named `var'
5 Answers
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What do people find difficult about C pointers? [closed]
...eability with references ,which is often another caveat of pointers and an error of newcomers, makes understanding pointers hard. It's also important to understand, for completion's sake, that pointers to references are illegal in C and C++ for confusing reasons that take you into lvalue-rvalue sema...
What is the purpose of python's inner classes?
... binding can be recreated without inner class at the cost of a tedious and error-prone instrumentation of the classes.
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What is a PDB file?
...ith the JIT window, rather than "This program needs to end, send a Windows Error Report")
– Jared Harley
Oct 10 '10 at 8:32
21
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Hidden features of mod_rewrite
...rentely the variable gets set to 200 for a redirect, but also other pages (error and stuff) set it to some value. Now that means that you either check if it is empty, is not empty, is 200 or is not 200, depending on what you need.
– Qwerty
May 25 '14 at 0:17
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Java Interfaces/Implementation naming convention [duplicate]
... (throwing exceptions for arguments that shouldn't be null, etc) and catch errors in testing, using a more efficient implementation in production code (not checking arguments that should not be null for being null since the mock threw exceptions in your tests and you know that the arguments aren't n...
What is @ModelAttribute in Spring MVC?
...ring managed model. If the named bean is not found, instead of throwing an error or returning null, it implicitly takes on the role of @Bean i.e. Create a new instance using the default constructor and add the bean to the model.
For method annotations, think of @ModelAttribute as the equivalent of ...
Java Generics (Wildcards)
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List<? extends Number> nums = ints;
nums.add(3.14); // compile-time error
assert ints.toString().equals("[1, 2, 3.14]");
To put elements into the structure we need another kind of wildcard called Wildcards with super,
List<Object> objs = Arrays.<Object>asList(2, 3.14, "four"...