inline

问题 Is it worth it to use the inline keyword or the compiler is smart enough to know when he needs to inline a function ? 回答1: The compiler is pretty smart, and has multiple metrics to figure out if something is worth inlining. But sometimes however the developer will have knowledge about how the application is going to be run and will know to inline something that the compiler doesn't do automatically. However, I would never inline stuff manually unless I had a done some benchmarks and found

问题 Is it worth it to use the inline keyword or the compiler is smart enough to know when he needs to inline a function ? 回答1: The compiler is pretty smart, and has multiple metrics to figure out if something is worth inlining. But sometimes however the developer will have knowledge about how the application is going to be run and will know to inline something that the compiler doesn't do automatically. However, I would never inline stuff manually unless I had a done some benchmarks and found

问题 Consider the following two method calls that are nearly equivalent. Take note of the way the byte array is declared and allocated on both. void Method1() { byte [] bytearray = new byte[16]; /* some code */ } void Method2() { byte [] bytearray = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; /* some code */ } In both cases, assume that when Method1 and Method2 return, "bytearray" is a candidate for garbage collection since none of the code that manipulates the bytearray variable will be holding a

问题 Presently we do this... let parseDate defaultVal text = match DateTime.TryParse s with | true, d -> d | _ -> defaultVal Is it possible to do this... let d : DateTime = tryParse DateTime.MinValue "2015.05.01" 回答1: Yes. Welcome to the world of member constraints, ref, and byref values. let inline tryParseWithDefault defaultVal text : ^a when ^a : (static member TryParse : string * ^a byref -> bool) = let r = ref defaultVal if (^a : (static member TryParse: string * ^a byref -> bool) (text, &r

问题 Presently we do this... let parseDate defaultVal text = match DateTime.TryParse s with | true, d -> d | _ -> defaultVal Is it possible to do this... let d : DateTime = tryParse DateTime.MinValue "2015.05.01" 回答1: Yes. Welcome to the world of member constraints, ref, and byref values. let inline tryParseWithDefault defaultVal text : ^a when ^a : (static member TryParse : string * ^a byref -> bool) = let r = ref defaultVal if (^a : (static member TryParse: string * ^a byref -> bool) (text, &r

问题 Is it possible to inlcude code from a svg file directly into a twig template file? Something like: {% include 'my.svg' %} that will result in: <svg viewbox=".... /> 回答1: One way of doing this: {{ source('my.svg') }} Read more here: https://www.theodo.fr/blog/2017/01/integrating-and-interacting-with-svg-image-files-using-twig/ 回答2: Had a similar issue, ended up renaming my svgs to be .twig files. {% include 'my.svg.twig' %} 回答3: You can do in a Drupal8 theme via setting a new variable:

问题 Is it possible to inlcude code from a svg file directly into a twig template file? Something like: {% include 'my.svg' %} that will result in: <svg viewbox=".... /> 回答1: One way of doing this: {{ source('my.svg') }} Read more here: https://www.theodo.fr/blog/2017/01/integrating-and-interacting-with-svg-image-files-using-twig/ 回答2: Had a similar issue, ended up renaming my svgs to be .twig files. {% include 'my.svg.twig' %} 回答3: You can do in a Drupal8 theme via setting a new variable:

问题 I am trying to embed a bunch of small images in an html table which I want to send using MFMailComposeViewController. After doing some search I figured out almost everyone is suggesting "NSData+Base64 by Matt Gallagher" class to encode the photo in Base64encoding and embedding it into html. While it looks to work on iPhone and with some email servers but Gmail and Yahoo do not show the images embedded this way. This problem is mentioned here as well. I was wondering if anyone has a better

问题 I want a header file with a non-integral constant in it, e.g. a class. Note the constant does not need to be a compile-time constant. static const std::string Ten = "10"; This compiles but is undesirable as each compilation unit now has its own copy of Ten. const std::string Ten = "10"; This will compile but will fail with a linker error for multiply defined Ten. constexpr std::string Ten = "10"s; This would work but only if the strings constructor was constexpr as well. It will be but I can

问题 require(inline) func <- cxxfunction(, 'return Rcpp::wrap( qnorm(0.95,0.0,1.0) );' ,plugin="Rcpp") error: no matching function for call to ‘qnorm5(double, int, int)’ require(inline) func <- cxxfunction(, 'return Rcpp::wrap( qnorm(0.95, 0.0, 1.0, 1, 0) );' ,plugin="Rcpp") error: no matching function for call to ‘qnorm5(double, double, double, int, int)’ require(inline) code <-' double a = qnorm(0.95, 0.0, 1.0); return Rcpp::wrap( a ); ' func <- cxxfunction(, code ,plugin="Rcpp") func() error: