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Polymorphism in C++
...ompiler-provided polymorphism for builtin types, Standard conversions, and casting/coercion are discussed later for completeness as:
they're commonly intuitively understood anyway (warranting a "oh, that" reaction),
they impact the threshold in requiring, and seamlessness in using, the above mecha...
C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...下步骤：
1、导入并封装Excel中的接口
Excel作为OLE/COM库插件，定义好了各类交互的接口，这些接口是跨语言的接口。VC可以通过导入这些接口，并通过接口来对Excel的操作。
由于本文只关心对Excel表格中的数据的读取，主要关注...
C++ convert from 1 char to string? [closed]
I need to cast only 1 char to string . The opposite way is pretty simple like str[0] .
2 Answers
...
How can I generate a unique ID in Python? [duplicate]
I need to generate a unique ID based on a random value.
8 Answers
8
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How do you view ALL text from an ntext or nvarchar(max) in SSMS?
... on it would open it in a new window. The work around I normally use is to cast it to XML as here. XML data can be set to allow unlimited length.
– Martin Smith
Aug 10 '12 at 9:10
...
Do I really have a car in my garage? [duplicate]
...rYears on a Vehicle without caring about the implementation.
Usually, downcasting is a sign of a flawed design: do not store your vehicles all together if you need to differenciate their actual type.
Note: of course the design here can be easily improved. It is just an example to demonstrate the p...
Is it possible to install another version of Python to Virtualenv?
...] DEST_DIR
Options:
--version show program's version number and exit.
-h, --help show this help message and exit.
-v, --verbose Increase verbosity.
-q, --quiet Decrease verbosity.
-p PYTHON_EXE, --python=PYTHON_EXE
The Pytho...
How to pass anonymous types as parameters?
...
If casting with "as" you should check if list is null
– Alex
Jul 8 '11 at 13:11
...
How to get the caller's method name in the called method?
...ccessing.
import inspect
from types import FrameType
from typing import cast
def caller_name() -> str:
"""Return the calling function's name."""
# Ref: https://stackoverflow.com/a/57712700/
return cast(FrameType, cast(FrameType, inspect.currentframe()).f_back).f_code.co_name
if...
How do you test functions and closures for equality?
...
Simplest way is designate the block type as @objc_block, and now you can cast it to an AnyObject which is comparable with ===. Example:
typealias Ftype = @objc_block (s:String) -> ()
let f : Ftype = {
ss in
println(ss)
}
let ff : Ftype = {
sss in
...