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What are the differences between a pointer variable and a reference variable in C++?
...t pointer's target can be replaced by taking its address and using a const cast.
A reference's target cannot be replaced in any way short of UB.
This should permit the compiler to do more optimization on a reference.
share...
Can I load a .NET assembly at runtime and instantiate a type knowing only the name?
...class implements a interface, so once I instantiate the class, I will then cast it to the interface.
13 Answers
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How to hide output of subprocess in Python 2.7
I'm using eSpeak on Ubuntu and have a Python 2.7 script that prints and speaks a message:
5 Answers
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List directory in Go
I've been trying to figure out how to simply list the files and folders in a single directory in Go.
5 Answers
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Location of my.cnf file on macOS
...L forum says:
By default, the OS X installation does not use a my.cnf, and MySQL just uses the default values. To set up your own my.cnf, you could just create a file straight in /etc.
OS X provides example configuration files at /usr/local/mysql/support-files/.
And if you can't find them th...
64 bit OS下int占几个字节？ - C/C++ - 清泛网 - 专注C/C++及内核技术
64 bit OS下int占几个字节？int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的，不受编译器的影响。__int64才是8位的。另外，指针是受编译器 OS影响的，3...int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的...
MYSQL Truncated incorrect DOUBLE value
...table1
WHERE 1
ORDER BY value1+0
The problem is ORDER BY value1+0 - type casting.
I know that it does not answer the question but this is the first result on Google for this error and it should have other examples where this error presents itself.
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MySQL - UPDATE query based on SELECT Query
...UPDATE
receipt_invoices dest,
(
SELECT
`receipt_id`,
CAST((net * 100) / 112 AS DECIMAL (11, 2)) witoutvat
FROM
receipt
WHERE CAST((net * 100) / 112 AS DECIMAL (11, 2)) != total
AND vat_percentage = 12
) src
SET
dest.price = src.witoutvat,
dest.amou...
Difference between malloc and calloc?
...tage of the OS's guarantee.
This means calloc memory can still be "clean" and lazily-allocated, and copy-on-write mapped to a system-wide shared physical page of zeros. (Assuming a system with virtual memory.)
Some compilers even can optimize malloc + memset(0) into calloc for you, but you should...
Solving “Who owns the Zebra” programmatically?
... problem.addConstraint(constraint, [v for v in variables if v in stmt])
and_statements = """
They drink coffee in the green house.
The man who smokes Pall Mall has birds.
The English man lives in the red house.
The Dane drinks tea.
In the yellow house they smoke Dunhill.
The man who smokes Blue M...