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How to find a hash key containing a matching value
... value. If
not found, returns nil.
h = { "a" => 100, "b" => 200 }
h.index(200) #=> "b"
h.index(999) #=> nil
So to get "orange", you could just use:
clients.key({"client_id" => "2180"})
sha...
Is there an online name demangler for C++? [closed]
...have created such an online serivice: https://demangler.com
This is a gcc c++ symbol demangler. You just copy a stack trace, or the output of nm into a text box, and it will return the output with the names demangled.
@Update: It now demangles MSVC and Java symbols also.
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Iterate through a C++ Vector using a 'for' loop
I am new to the C++ language. I have been starting to use vectors, and have noticed that in all of the code I see to iterate though a vector via indices, the first parameter of the for loop is always something based on the vector. In Java I might do something like this with an ArrayList:
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Difference between 'new operator' and 'operator new'?
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new is not an operator in C++. sizeof, for example, is an operator, but new and delete are not. new and delete are keywords and the syntactical constructs that these keywords form are called new-expression and delete-expression.
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Why is it OK to return a 'vector' from a function?
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Pre C++11:
The function will not return the local variable, but rather a copy of it. Your compiler might however perform an optimization where no actual copy action is made.
See this question & answer for further details.
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How to replace all dots in a string using JavaScript
...tity & #8203 ; twice, which is Unicode Character 'ZERO WIDTH SPACE' (U+200B). More information on fileformat.info/info/unicode/char/200b/index.htm
– Cœur
Feb 7 '13 at 14:07
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Exotic architectures the standards committees care about
I know that the C and C++ standards leave many aspects of the language implementation-defined just because if there is an architecture with other characteristics, it would be very difficult or impossible to write a standard conforming compiler for it.
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Object-orientation in C
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Now I pity C++... Well of course the C++ syntax is clearer, but since it's not a trivial syntax, I'm mitigated. I wonder if something hybrid between C++ and C could be achieved, so void* would still be valid castable type. The part with...
MySQL show status - active or total connections?
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Does a connection represent a user? So if there are 200 users on a page that makes database queries will be 200 connections?
– Diego Queiroz
Nov 21 '19 at 12:05
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How do I read an entire file into a std::string in C++?
...ndant copies is to do the reading manually in a loop, unfortunately. Since C++ now has guaranteed contiguous strings, one could write the following (≥C++14):
auto read_file(std::string_view path) -> std::string {
constexpr auto read_size = std::size_t{4096};
auto stream = std::ifstream...