I was browsing through some documentation and questions/answers and saw it mentioned. I read a brief description, stating that it would be basically a promise from the programmer that the pointer won’t be used to point somewhere else. Can anyone offer some realistic cases where its worth actually using this? 2 Answers 2
I’m working on a project that will read compiler error messages of a particular variety and do useful things with them. The sample codebase I’m testing this on (a random open-source application), and hence rebuilding frequently, contains a few bits that generate warnings, which are of no interest to me. How do I disable all … Read more
I’m trying to install Imagemagick on OSX Lion but something is not working as expected. -> brew install imagemagick /usr/local/git/bin/git ==> Cloning https://github.com/adamv/ImageMagick.git Cloning into /Users/klebershimabuku/Library/Caches/Homebrew/imagemagick–git… fatal: https://github.com/adamv/ImageMagick.git/info/refs not found: did you run git update-server-info on the server? Error: Failure while executing: git clone –depth 1 https://github.com/adamv/ImageMagick.git /Users/kleber/Library/Caches/Homebrew/imagemagick–git brew doctor says: -> brew doctor We … Read more
I would like to enable — literally — ALL of the warnings that GCC has. (You’d think it would be easy…) You’d think -Wall might do the trick, but nope! Still need -Wextra. You’d think -Wextra might do the trick, but nope! Not all of the warnings listed here (for example, -Wshadow) are enabled by … Read more
What would be the best way to write Objective-C on the Windows platform? Cygwin and gcc? Is there a way I can somehow integrate this into Visual Studio? Along those lines – are there any suggestions as to how to link in and use the Windows SDK for something like this. Its a different beast … Read more
I have found an interesting performance regression in a small C++ snippet, when I enable C++11: #include <vector> struct Item { int a; int b; }; int main() { const std::size_t num_items = 10000000; std::vector<Item> container; container.reserve(num_items); for (std::size_t i = 0; i < num_items; ++i) { container.push_back(Item()); } return 0; } With g++ (GCC) … Read more
I have to define a 24-bit data type.I am using char[3] to represent the type. Can I typedef char[3] to type24? I tried it in a code sample. I put typedef char[3] type24; in my header file. The compiler did not complain about it. But when I defined a function void foo(type24 val) {} in … Read more
When I’m compiling openvswitch-1.5.0, I’ve encountered the following compile error: gcc -Wstrict-prototypes -Wall -Wno-sign-compare -Wpointer-arith -Wdeclaration-after-statement -Wformat-security -Wswitch-enum -Wunused-parameter -Wstrict-aliasing -Wbad-function-cast -Wcast-align -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-field-initializers -Wno-override-init -g -O2 -export-dynamic ***-lpthread*** -o utilities/ovs-dpctl utilities/ovs-dpctl.o lib/libopenvswitch.a /home/jyyoo/src/dpdk/build/lib/librte_eal.a /home/jyyoo/src/dpdk/build/lib/libethdev.a /home/jyyoo/src/dpdk/build/lib/librte_cmdline.a /home/jyyoo/src/dpdk/build/lib/librte_hash.a /home/jyyoo/src/dpdk/build/lib/librte_lpm.a /home/jyyoo/src/dpdk/build/lib/librte_mbuf.a /home/jyyoo/src/dpdk/build/lib/librte_ring.a /home/jyyoo/src/dpdk/build/lib/librte_mempool.a /home/jyyoo/src/dpdk/build/lib/librte_malloc.a -lrt -lm /usr/bin/ld: /home/jyyoo/src/dpdk/build/lib/librte_eal.a(eal.o): undefined reference to symbol ‘pthread_create@@GLIBC_2.2.5’ /lib/x86_64-linux-gnu/libpthread.so.0: error … Read more
For instance: Bool NullFunc(const struct timespec *when, const char *who) { return TRUE; } In C++ I was able to put a /*…*/ comment around the parameters. But not in C of course, where it gives me the error: error: parameter name omitted 12 Answers 12
I’ve been reading about div and mul assembly operations, and I decided to see them in action by writing a simple program in C: File division.c #include <stdlib.h> #include <stdio.h> int main() { size_t i = 9; size_t j = i / 5; printf(“%zu\n”,j); return 0; } And then generating assembly language code with: gcc … Read more