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Is it good practice to NULL a pointer after deleting it?
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Setting a pointer to 0 (which is "null" in standard C++, the NULL define from C is somewhat different) avoids crashes on double deletes.
Consider the following:
Foo* foo = 0; // Sets the pointer to 0 (C++ NULL)
delete foo; ...
What does the git index contain EXACTLY?
...th the content of a commit.
When you switch branch, the index content is reset to the commit referenced by the branch you just switched to.
Git 2.20 (Q4 2018) adds an Index Entry Offset Table (IEOT):
See commit 77ff112, commit 3255089, commit abb4bb8, commit c780b9c, commit 3b1d9e0, commit 371ed0d ...
Escape double quotes in parameter
...the purpose of making other people's code legible, I'll explain.
Here's a set of basic rules:
When not wrapped in double-quoted groups, spaces separate parameters:program param1 param2 param 3 will pass four parameters to program.exe: param1, param2, param, and 3.
A double-quoted group ...
How do you track record relations in NoSQL?
...l way.
There is a risk with denormalization and redundancy that redundant sets of data will get out of sync with one another. This is called an anomaly. When you use a normalized relational database, the RDBMS can prevent anomalies. In a denormalized database or in NoSQL, it becomes your respons...
Cross cutting concern example
...needed where only authentic user can enter into the application with right set of privileges. We need to know how your application performs then we need to do profiling.
In case application is used by international users(with their own localized language), then we need to support the same in applic...
Extract traceback info from an exception object
...ns the traceback. This attribute is also writable, and can be conveniently set using the with_traceback method of exceptions:
raise Exception("foo occurred").with_traceback(tracebackobj)
These features are minimally described as part of the raise documentation.
All credit for this part of the a...
Change one value based on another value in pandas
...iginal animal column with values from other columns, and using np.where to set a conditional substring based on the value of age:
# append 's' to 'age' if it's greater than 1
df.animal = df.animal + ", " + df.type + ", " + \
df.age.astype(str) + " year" + np.where(df.age > 1, 's', '')
In [3...
stdbool.h C99标准杂谈 - C/C++ - 清泛网 - 专注C/C++及内核技术
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Microsoft C conforms to the standard for the C language as set forth in the 9899:1990 edition of the ANSI C standard.
VS2012不支持：
https://social.msdn.microsoft.com/Forums/zh-CN/19818b42-3a4c-47bd-94d3-5dcde7f0df70/vs2012-c99
但是貌似自VS2013开始部分支持：
h...
How to parse a string to an int in C++?
...nts than that, one of them being a point to size_t that's, if not null, is set to the first unconverted character
– Zharf
Oct 13 '12 at 10:36
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Detecting endianness programmatically in a C++ program
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You can do it by setting an int and masking off bits, but probably the easiest way is just to use the built in network byte conversion ops (since network byte order is always big endian).
if ( htonl(47) == 47 ) {
// Big endian
} else {
/...