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Why do we have map, fmap and liftM?
...t learning Haskell, when using map incorrectly, would much
rather see an error about lists than about Functors.
-- Typeclassopedia, page 20
fmap and liftM exist because monads were not automatically functors in Haskell:
The fact that we have both fmap and liftM is an
unfortunate consequen...
Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint
Below is the error message I receive in the debug area. It runs fine and nothing is wrong except that I receive this error. Would this prevent apple accepting the app? How do I fix it?
...
Is it better to specify source files with GLOB or each file individually in CMake?
...e years I have come to recognise that explicitly listing the files is less error-prone for large, multi-developer projects.
Original answer:
The advantages to globbing are:
It's easy to add new files as they
are only listed in one place: on
disk. Not globbing creates
duplication.
Your CMakeLis...
Missing XML comment for publicly visible type or member
...erties (in 'Project properties' go to Project properties -> Build > "Errors and warnings" (section), Suppress Warnings (textbox), add 1591 (comma separated list)). By default it will change Active Configuration, consider to change configuration to All.
Use #pragma warning disable 1591 to disab...
Is there a “goto” statement in bash?
...s make it so that labels start like so : start: so that they aren't syntax errors.
– Alexej Magura
Apr 7 '17 at 18:03
5
...
What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
...rameter is present, and if it's not provided, the require method throws an error. It returns an instance of ActionController::Parameters for the key passed into require.
The permit method returns a copy of the parameters object, returning only the permitted keys and values. When creating a new Acti...
In PHP, what is a closure and why does it use the “use” identifier?
...
The as keyword in the use statement is giving me a syntax error in php 5.5: $closure = function ($value) use ($localVar as $alias) { //stuff}; Error given is: Parse: syntax error, unexpected 'as' (T_AS), expecting ',' or ')'
– Kal Zekdor
Jul 29...
Colors in JavaScript console
...\Custom.css if you are in WinXP, but the directory varies by OS.
.console-error-level .console-message-text{
color: red;
}
.console-warning-level .console-message-text {
color: orange;
}
.console-log-level .console-message-text {
color:green;
}
...
'System.Net.Http.HttpContent' does not contain a definition for 'ReadAsAsync' and no extension metho
...t made. The console app code does not compile. It gives me the compilation error:
6 Answers
...
How to change column order in a table using sql query in sql server 2005?
...en click save. This method actually drops and recreates the table, so some errors might occur.
If Change Tracking option is enabled for the database and the table, you shouldn't use this method.
If it is disabled, the Prevent saving changes that require the table re-creation option should be clear...