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Legality of COW std::string implementation in C++11
...< *p << '\n'; // p is dangling
The point of that example is to demonstrate why GCC's reference counted (COW) string is not valid in C++11. The C++11 standard requires this code to work correctly. Nothing in the code permits the p to be invalidated in C++11.
Using GCC's old reference-cou...
How to inspect the return value of a function in GDB?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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NodeJS: Saving a base64-encoded image to disk
My Express app is receiving a base64-encoded PNG from the browser (generated from canvas with toDataURL() ) and writing it to a file. But the file isn't a valid image file, and the "file" utility simply identifies it as "data".
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What optimizations can GHC be expected to perform reliably?
...ersion 7.4.2, stage 2 booted by GHC version 7.4.1
Using binary package database: /usr/lib/ghc-7.4.2/package.conf.d/package.cache
wired-in package ghc-prim mapped to ghc-prim-0.2.0.0-7d3c2c69a5e8257a04b2c679c40e2fa7
wired-in package integer-gmp mapped to integer-gmp-0.4.0.0-af3a28fdc4138858e0c7c5ecc2...
How to prevent page scrolling when scrolling a DIV element?
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Update 2: My solution is based on disabling the browser's native scrolling altogether (when cursor is inside the DIV) and then manually scrolling the DIV with JavaScript (by setting its .scrollTop property). An alternative and IMO better approach wou...
Android Facebook style slide
...ct.
Also this lib should be compatible this ActionBar pattern, because is based on Activities transactions and TranslateAnimations (not Fragments transactions and custom Views).
Right now, the most problem is to make it work well for application, which support both portrait and landscape mode. If ...
Is it possible to print a variable's type in standard C++?
...fix(prefix.size());
name.remove_suffix(suffix.size());
return name;
}
Demo.
Similarly, to get the enum name at compile-time, if you like :)
#include <string_view>
template <auto E>
constexpr auto enum_name() noexcept {
static_assert(std::is_enum_v<decltype(E)>);
std::stri...
Pandas percentage of total with groupby
...e level='state' kwarg in div tells pandas to broadcast/join the dataframes base on the values in the state level of the index.
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Is there a REAL performance difference between INT and VARCHAR primary keys?
...ary key, then do it.
Don't use either strategy for all tables in your database. It's likely that in some cases, a natural key is better, but in other cases a surrogate key is better.
Other folks make a good point that it's rare in practice for a natural key to never change or have duplicates, s...