include

问题 Let's assume I define BAR in foo.h. But foo.h might not exist. How do I include it, without the compiler complaining at me? #include "foo.h" #ifndef BAR #define BAR 1 #endif int main() { return BAR; } Therefore, if BAR was defined as 2 in foo.h, then the program would return 2 if foo.h exists and 1 if foo.h does not exist. 回答1: In general, you'll need to do something external to do this - e.g. by doing something like playing around with the search path (as suggested in the comments) and

问题 I took this example from a different question. I am building an R package with Rcpp. I have a function like fun1 (below) that I want to put into its own .cpp file. Then I want to call fun1 with other functions (like fun() does below). I want fun1 in a separate file because I am going to call it from several Rcpp functions that are in different .cpp files. Are there certain include statements and things I need to do to make the fun1 function accessible in the .cpp where fun() is located? Thank

问题 I took this example from a different question. I am building an R package with Rcpp. I have a function like fun1 (below) that I want to put into its own .cpp file. Then I want to call fun1 with other functions (like fun() does below). I want fun1 in a separate file because I am going to call it from several Rcpp functions that are in different .cpp files. Are there certain include statements and things I need to do to make the fun1 function accessible in the .cpp where fun() is located? Thank

问题 I took this example from a different question. I am building an R package with Rcpp. I have a function like fun1 (below) that I want to put into its own .cpp file. Then I want to call fun1 with other functions (like fun() does below). I want fun1 in a separate file because I am going to call it from several Rcpp functions that are in different .cpp files. Are there certain include statements and things I need to do to make the fun1 function accessible in the .cpp where fun() is located? Thank

问题 cat main.c #include <stdio.h> #include <stdlib.h> #include <linux/ext2_fs.h> int main(int argc, char** argv) { return (EXIT_SUCCESS); } Here is my output... gcc main.c In file included from main.c:3: /usr/include/linux/ext2_fs.h: In function ‘ext2_mask_flags’: /usr/include/linux/ext2_fs.h:182: error: ‘FS_DIRSYNC_FL’ undeclared (first use in this function) /usr/include/linux/ext2_fs.h:182: error: (Each undeclared identifier is reported only once /usr/include/linux/ext2_fs.h:182: error: for

问题 cat main.c #include <stdio.h> #include <stdlib.h> #include <linux/ext2_fs.h> int main(int argc, char** argv) { return (EXIT_SUCCESS); } Here is my output... gcc main.c In file included from main.c:3: /usr/include/linux/ext2_fs.h: In function ‘ext2_mask_flags’: /usr/include/linux/ext2_fs.h:182: error: ‘FS_DIRSYNC_FL’ undeclared (first use in this function) /usr/include/linux/ext2_fs.h:182: error: (Each undeclared identifier is reported only once /usr/include/linux/ext2_fs.h:182: error: for

问题 how should a conditional php include be written for it to take effect? I have edited my cart's main index.php so as to include the appropriate config file based on the current url, though the way it is written doesn't work: (whole file below, my edition is between //mine START and //mine END) <?php session_start(); @$cart = $_SESSION["cart"]; if ($cart == "") { $cart = md5(uniqid(rand())); $_SESSION["cart"] = $cart; } foreach ($_GET as $get_key => $get_value) { if ((preg_match("/\//", $get

问题 how should a conditional php include be written for it to take effect? I have edited my cart's main index.php so as to include the appropriate config file based on the current url, though the way it is written doesn't work: (whole file below, my edition is between //mine START and //mine END) <?php session_start(); @$cart = $_SESSION["cart"]; if ($cart == "") { $cart = md5(uniqid(rand())); $_SESSION["cart"] = $cart; } foreach ($_GET as $get_key => $get_value) { if ((preg_match("/\//", $get

来源： https://stackoverflow.com/questions/2666736/how-to-include-static-html-in-php-smarty

来源： https://stackoverflow.com/questions/64381665/recursive-include-of-files-in-opencl-source-under-xcode