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Should we pass a shared_ptr by reference or by value?
When a function takes a shared_ptr (from boost or C++11 STL), are you passing it:
10 Answers
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How can i get the session object if i have the entity-manager
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JPA 1.0
With JPA 1.0, you'd have to use EntityManager#getDelegate(). But keep in mind that the result of this method is implementation specific i.e. non portable from application server using Hibernate to the other. For example with JBoss you would do:
org.hibernate.Session session = (Session) m...
What is the meaning of prepended double colon “::”?
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@NoniA. are you asking what the second set of double colons does?
– FCo
Jun 2 '17 at 18:48
1
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Select rows of a matrix that meet a condition
...me(). In that case the previous answers (using subset or m$three) will work, otherwise they will not.
To perform the operation on a matrix, you can define a column by name:
m[m[, "three"] == 11,]
Or by number:
m[m[,3] == 11,]
Note that if only one row matches, the result is an integer vector...
Read file line by line using ifstream in C++
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First, make an ifstream:
#include <fstream>
std::ifstream infile("thefile.txt");
The two standard methods are:
Assume that every line consists of two numbers and read token by token:
int a, b;
while (infile >> a >...
How can I obtain an 'unbalanced' grid of ggplots?
...ot figures in a grid to achieve a multi-panel figure by using something like:
4 Answers
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How to change checkbox's border style in CSS?
How can I change checkbox (input) border's style? I've put border:1px solid #1e5180 upon it, but in FireFox 3.5, nothing happens!
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Difference between single and double quotes in Bash
...t interpolate anything, but double quotes will. For example: variables, backticks, certain \ escapes, etc.
Example:
$ echo "$(echo "upg")"
upg
$ echo '$(echo "upg")'
$(echo "upg")
The Bash manual has this to say:
3.1.2.2 Single Quotes
Enclosing characters in single quotes (') preserves...
How to convert a NumPy array to PIL image applying matplotlib colormap
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Peter Mortensen
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answered Jun 10 '12 at 8:55
fraxelfraxel
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Difference in make_shared and normal shared_ptr in C++
Many google and stackoverflow posts are there on this, but I am not able to understand why make_shared is more efficient than directly using shared_ptr .
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