compilation

问题 So my questions is: Why do you need '-lpthread' at the end of a compiling command? Why does this command work: gcc -o name name.c -lpthread but this won't: gcc -o name name.c I am using the pthread.h library in my c code. I already looked online for some answers but didn't really find anything that answered it understandably 回答1: pthread.h is not a library it is just a header file which gives you declaration (not the actual body of function) of functions which you will be using for multi

问题 Is there a way to save HHVM bytecode as a file, since HHVM uses JIT bytecode compilation instead of compiling? If not, are there any alternatives for modern PHP versions (5.5,5.6)? 回答1: You can generate bytecode, which is saved in internal SQLite database and then switch on Repo.Authoritative mode, under which HHVM will only use bytecode from SQLite db and never touch source .php files. See http://hhvm.com/blog/4061/go-faster 来源： https://stackoverflow.com/questions/25815519/is-it-possible-to

问题 i have a struct in user package called account type Account struct { Tp string `json:"type"bson:"type"` AccountId string `json:"account_id"bson:"account_id"` Credentials map[string]interface{} `json:"credentials,omitempty"bson:"credentials,omitempty"` ProfilePicture string `json:"profile_picture,omitempty"` Username string `json:"username"bson:"username"` AccessToken map[string]interface{}`bson:"access_token,omitempty"` } and in user/accounts im trying to embed this account struct into

问题 I don't have CUDA-enabled Nvidia GPU, and I want to force MATLAB to run the code on CPU instead of GPU (yes, I know, it will be very very slow). How can I do it? As an example, let’s try to run this code on my PC without CUDA. Here is the error given by MATLAB: There is a problem with the CUDA driver or with this GPU device. Be sure that you have a supported GPU and that the latest driver is installed. Error in nnet.internal.cnn.SeriesNetwork/activations (line 48) output = gpuArray(data);

问题 I am trying to write a C++ loop that I want evaluated at compile-time. This is because I need to use the looping variable as a template argument to initialize a class. In the very simple case it would look something like: for (unsigned int i = 1; i < 8; i++) { Vector<i> foo; // do something with foo } After going through some similar StackOverflow questions, I found a way to write a static for loop recursively. Now my code looks something like this: template <unsigned int i, unsigned int end>

问题 I am trying to write a C++ loop that I want evaluated at compile-time. This is because I need to use the looping variable as a template argument to initialize a class. In the very simple case it would look something like: for (unsigned int i = 1; i < 8; i++) { Vector<i> foo; // do something with foo } After going through some similar StackOverflow questions, I found a way to write a static for loop recursively. Now my code looks something like this: template <unsigned int i, unsigned int end>

问题 If I have following type hierarchy: abstract class TicketBase { public DateTime PublishedDate { get; set; } } class TicketTypeA:TicketBase { public string PropertyA { get; set; } } class TicketTypeB:TicketBase { public string PropertyB { get; set; } } and many more TicketTypes : TicketBase and want to create a function which selects any property e.g. PropertyA from any ticket type e.g. TicketTypeA I wrote this function: private Func<TicketBase, String> CreateSelect(Type t, String FieldName) {

问题 I'm writing a c program on Linux that writes text into a file. I'm having trouble where i'M trying to use system("gcc fileName.c") to compile the new document i created into an executable. The file is getting the following input: char Msg[100] = {"#include <stdio.h>\nint main();\n\nint main()\n{\n\n\treturn 0;\n}"}; clearly it has a main() function and yet it still gives me the following wall of error: /usr/bin/ld: /usr/lib/debug/usr/lib/i386-linux-gnu/crt1.o(.debug_info): relocation 0 has

问题 I have the following problem: I am compiling C#-code at runtime using the CSharpCodeProvider in Microsoft.CSharp . The created application runs perfectly, if I double-click on the generated file. If, however, I am loading my created assembly with Assembly.Load and invoking the entrypoint-method with Assembly.Load("...").EntryPoint.Invoke(null, null) , I get a NullReferenceException . The NullReferenceException is referring to the value of the .EntryPoint -Property. When I debug the variable

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Unit test compile-time error I'm wondering if its possible to write a kind of unit test which will verify that a given code doesn't compile. For example, I have a template class: #include <boost/static_assert.hpp> #include <boost/type_traits/is_base_of.hpp> struct bar_base {}; template <typename T> class foo { BOOST_STATIC_ASSERT(::boost::is_base_of<T, bar_base>::value); }; So, the test should succeed with: