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Determine the data types of a data frame's columns
...ation as a vector (i.e. you don't need it to do something else programmatically later), just use str(foo).
In both cases foo would be replaced with the name of your data frame.
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Should we pass a shared_ptr by reference or by value?
...
I ran the code below, once with foo taking the shared_ptr by const& and again with foo taking the shared_ptr by value.
void foo(const std::shared_ptr<int>& p)
{
static int x = 0;
*p = ++x;
}
int main()
{
auto p = std::make_shared...
Javascript objects: get parent [duplicate]
...}.init();
Inside the init function you can get the parent object simply calling this.
So we define the parent property directly inside the child object.
Then (optionally) we can remove the init method.
Finally we give the main object back as output from the init function.
If you try to get main...
On duplicate key ignore? [duplicate]
...
Would suggest NOT using INSERT IGNORE as it ignores ALL errors (ie its a sloppy global ignore).
Instead, since in your example tag is the unique key, use:
INSERT INTO table_tags (tag) VALUES ('tag_a'),('tab_b'),('tag_c') ON DUPLICATE KEY UPDATE tag=tag;
on duplicate key pro...
In CMake, how can I test if the compiler is Clang?
...CMAKE_CXX_COMPILER_ID variable is only available after the command project(Foo CXX).
– waldyrious
Jun 1 '16 at 18:28
5
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What is the difference between include and extend in Ruby?
...end Mod. In this case the individual object gets Mod's methods even though all other objects with the same class as o do not.
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Equivalent of typedef in C#
...impact that source file. In C and C++, my experience is that typedef is usually used within .h files which are included widely - so a single typedef can be used over a whole project. That ability does not exist in C#, because there's no #include functionality in C# that would allow you to include th...
Assigning out/ref parameters in Moq
...erface IGobbler
{
bool Gobble(ref int amount);
}
delegate void GobbleCallback(ref int amount); // needed for Callback
delegate bool GobbleReturns(ref int amount); // needed for Returns
var mock = new Mock<IGobbler>();
mock.Setup(m => m.Gobble(ref It.Ref<int>.IsAny)) //...
git pull aborted with error filename too long
...ates, looks like there is some additional script you need to run after installing mysysgit github.com/msysgit/git/pull/122#issuecomment-43653756
– Adam Grant
Aug 1 '14 at 18:36
18
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Array to Hash Ruby
...ue pairs: http://www.ruby-doc.org/core-2.1.0/Array.html#method-i-to_h.
[[:foo, :bar], [1, 2]].to_h
# => {:foo => :bar, 1 => 2}
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