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What is the best way to use a HashMap in C++?
...p the elements are sorted by the key, insert and access is in O(log n). Usually the standard library internally uses red black trees for ordered maps. But this is just an implementation detail. In an unordered map insert and access is in O(1). It is just another name for a hashtable.
An example wit...
boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
... first key, then the second key if the first one is equal, etc. This order allows for partial searches where only the first keys are specified:
phonebook pb;
...
// look for all Whites
std::pair<phonebook::iterator,phonebook::iterator> p=
pb.equal_range(boost::make_tuple(std::string("Whi...
Dynamically update values of a chartjs chart
... In every single answer I see everyone using the chart object globally. Is there no other way to retrieve this object? I have a lot of charts and so assigning them globally is a problem.
– Axelle
Jun 23 at 9:57
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What is the difference between instanceof and Class.isAssignableFrom(…)?
...s Y which extends Z which extends A), results might be different.
it is usually advised to write the code first picking one of the operators (the most convenient) and then profile your code to check if there are a performance bottleneck. Maybe this operator is negligible in the context of your code,...
How to declare strings in C [duplicate]
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This link should satisfy your curiosity.
Basically (forgetting your third example which is bad), the different between 1 and 2 is that 1 allocates space for a pointer to the array.
But in the code, you can manipulate them as pointers all the same -- only thing, you cann...
How to 'insert if not exists' in MySQL?
... any AUTO_INCREMENT column with failed insert. Probably because it's not really failed, but UPDATE'd.
– not2qubit
Oct 29 '13 at 21:36
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Remove redundant paths from $PATH variable
...<the name of the user>/.bashrc file. the /etc/bash.bashrc applies to all users.
– hovanessyan
Jul 25 '12 at 13:59
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vertical alignment of text element in SVG
...aligned with the corresponding baseline of the parent. For example,
this allows alphabetic baselines in Roman text to stay aligned across
font size changes. It defaults to the baseline with the same name as
the computed value of the alignment-baseline property. That is, the
position of "ideo...
Is it possible to rename a maven jar-with-dependencies?
...jar-with-dependencies" suffix.
The configuration below will output a jar called "test.jar"
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2-beta-4</version>
<executions>
<execution>
<id>jar-with-dependencies</id...
Way to get number of digits in an int?
...K, there is nothing "un-neat" about it. You have to realize that mathematically, numbers don't have a length, nor do they have digits. Length and digits are both properties of a physical representation of a number in a specific base, i.e. a String.
A logarithm-based solution does (some of) the same...