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Templated check for the existence of a class member function?
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And on to explanations. First, sfinae_true is a helper type, and it basically amounts to the same as writing decltype(void(std::declval<T>().stream(a0)), std::true_type{}). The advantage is simply that it's shorter.
Next, the struct has_stream : decltype(...) inherits from either std::true_...
Group a list of objects by an attribute : Java
...) returns null when hashMap.contanisKey() return false. You could save the call to containsKey() method if you call first hashMap.get(), store result in a local var, and check if this local var is null
– Esteve
Jan 18 '18 at 9:45
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How to determine if binary tree is balanced?
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Theoretically, I would have to side with Donal Fellows' definition still.
– Dhruv Gairola
May 6 '12 at 16:30
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AngularJS : When to use service instead of factory
... () to the injected function reference. Could also be run with injectedArg.call(this) or similar.
Factory : Could be useful for returning a ‘class’ function that can then be new`ed to create instances.
So, use a factory when you have complex logic in your service and you don't want expose this...
Java 8 Streams - collect vs reduce
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why we would get concurrent modification exception , calling streams is just gonna retrun serial stream and which means its gonna be processed by single thread and combiner function is not at all called ?
– amarnath harish
Aug 24 '18 at 11...
Convert a String In C++ To Upper Case
...form extremely badly with g++ 5.2 -O3, and Boost 1.58 (like 30x worse than calling glibc's toupper in a loop.) There's a dynamic_cast of the locale that doesn't get hoisted out of the per-char loop. See my answer. On the plus side, this may be properly UTF-8 aware, but the slowdown doesn't come f...
Setting DIV width and height in JavaScript
I have a div with id="div_register" . I want to set its width dynamically in JavaScript.
6 Answers
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Why does Ruby 1.9.2 remove “.” from LOAD_PATH, and what's the alternative?
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File.expand_path(__FILE__) et al
or doing
require './filename' (ironically).
or by using
require_relative 'filename'
or adding an "include" directory
ruby -I . ...
or the same, using irb;
$irb -I .
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What are some better ways to avoid the do-while(0); hack in C++?
... to an easy-to-reason-about size. If you don't want to pay for a function call, mark it forceinline.
– Ben Voigt
Aug 30 '13 at 3:49
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fatal: 'origin' does not appear to be a git repository
... trying to pull from master)
git pull origin master
for me that simple call solved those error messages:
fatal: 'master' does not appear to be a git repository
fatal: Could not read from remote repository.
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