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Type erasure techniques
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I would also consider (similar to void*) the use of "raw storage": char buffer[N].
In C++0x you have std::aligned_storage<Size,Align>::type for this.
You can store anything you want in there, as long as it's small enough and you deal with the alignment properly.
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When should one use a 'www' subdomain?
...nce to its web service?
What would you rather write/type/say.. "www." (4 chars) or "http://" (7 chars) ??
"www." is an established shorthand way of unambiguously communicating the fact that the subject is a web address, not a URL for another network service.
When verbally communicating a web add...
How do you use gcc to generate assembly code in Intel syntax?
...ked in my man page:
-masm=dialect
Output asm instructions using selected dialect. Supported choices
are intel or att (the default one). Darwin does not support intel.
It may work on your platform.
For Mac OSX:
clang++ -S -mllvm --x86-asm-syntax=intel test.cpp
Source: https:...
C++及Windows异常处理(try，catch; __try,__finally, __except) - C/C++ - ...
...ss File_handle {
FILE* p;
public:
File_handle(const char* n, const char* a)
{ p = fopen(n,a); if (p==0) throw Open_error(errno); }
File_handle(FILE* pp)
{ p = pp; if (p==0) throw Open_error(errno); }
~File_handle() { fclose(p); }
...
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?
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C# example to error at compile time.
class Foo
{
const char Sum = (1000 + 1) * 1000 / 2;
}
Produces the following compilation error:
Constant value '500500' cannot be converted to a 'char'
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How to compare strings ignoring the case
...t; false
>> require 'active_support/all'
=> true
>> str1.mb_chars.downcase.to_s.casecmp(str2.mb_chars.downcase.to_s) == 0
=> true
It works this way in Ruby 2.3.1 and earlier versions.
For smaller memory footprint you can cherry pick string/multibyte:
require 'active_support'
re...
Convert string with comma to integer
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If someone is looking to sub out more than a comma I'm a fan of:
"1,200".chars.grep(/\d/).join.to_i
dunno about performance but, it is more flexible than a gsub, ie:
"1-200".chars.grep(/\d/).join.to_i
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How to create ENUM type in SQLite?
... answer. Unless the string is really short, I'm totally against it. 1 or 2 characters maximum.
– MPelletier
May 9 '14 at 21:34
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What are POD types in C++?
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POD types have characteristics that non-POD types do not. For example, if you have a global, const, POD-type struct, you can initialize its contents with brace notation, it is put into read-only memory, and no code needs to be generated to...
How to split a delimited string in Ruby and convert it to an array?
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whitespace, with leading whitespace and runs of contiguous whitespace
characters ignored.
If pattern is a Regexp, str is divided where the pattern matches.
Whenever the pattern matches a zero-length string, str is split into
individual characters. If pattern contains groups, the respec...