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What's the best way to check if a file exists in C?
...(so does lstat(), but fstat() is safe). It depends what you're going to do based on the presence or absence of the file. Using the correct options to open() is usually the best way of dealing with the problems, but it can be tricky formulating the right options. See also discussions on EAFP (Easie...
Heap vs Binary Search Tree (BST)
... can be efficiently implemented on top of either dynamic arrays or pointer-based trees, BST only pointer-based trees. So for the heap we can choose the more space efficient array implementation, if we can afford occasional resize latencies.
binary heap creation is O(n) worst case, O(n log(n)) for BS...
How to convert wstring into string?
...
Here is a worked-out solution based on the other suggestions:
#include <string>
#include <iostream>
#include <clocale>
#include <locale>
#include <vector>
int main() {
std::setlocale(LC_ALL, "");
const std::wstring ws =...
How can I divide two integers to get a double?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
...read-only location, or to overwrite part of the operating system). Systems based on processors like the Motorola 68000 tend to refer to these events as Address or Bus errors.
Segmentation is one approach to memory management and protection in the operating system. It has been superseded by pagi...
How do I escape reserved words used as column names? MySQL/Create Table
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How to declare a friend assembly?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How can you escape the @ character in javadoc?
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Evaluating a mathematical expression in a string
...might be possible to break out using introspection:
eval('(1).__class__.__bases__[0].__subclasses__()', {'__builtins__': None})
Evaluate arithmetic expression using ast
import ast
import operator as op
# supported operators
operators = {ast.Add: op.add, ast.Sub: op.sub, ast.Mult: op.mul,
...
Listening for variable changes in JavaScript
... "watching" is not actually detecting a change. This is not event based, and would certainly slow down the entire app very very soon. These approaches IMHO should never be part of a real project.
– Muhammad bin Yusrat
Jan 17 '17 at 16:59
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