header-files

问题 What is the equivalent of numpy.get_include() as used here for Python, giving me the path to the directory where the Python header files are located? 回答1: The header files are in include directory. You can find the include dir using the distutils.sysconfig module from distutils.sysconfig import get_python_inc get_python_inc() #this gives the include dir You can read about it here 来源： https://stackoverflow.com/questions/14375222/find-python-header-path-from-within-python

问题 When I include some function from a header file in a C++ program, does the entire header file code get copied to the final executable or only the machine code for the specific function is generated. For example, if I call std::sort from the <algorithm> header in C++, is the machine code generated only for the sort() function or for the entire <algorithm> header file. I think that a similar question exists somewhere on Stack Overflow, but I have tried my best to find it (I glanced over it once

问题 I am fighting with Xcode 4 workspaces. Currently Xcode 4 wins. Thus, my situation: I have the workspace with the iOS app project. There is also static library project iOS app depends on in the this workspace. Solution #1 I try to configure like this: the app project: add to target's Build Phases > Link Binary With Library a product ( libmystaticlib.a ); set USER_HEADER_SEARCH_PATHS to $(TARGET_BUILD_DIR)/usr/local/include $(DSTROOT)/usr/local/include ; the static library project: add some

问题 I'm starting to program with CUDA, and in some examples I find the include files cuda.h , cuda_runtime.h and cuda_runtime_api.h included in the code. Can someone explain to me the difference between these files? 回答1: In very broad terms: cuda.h defines the public host functions and types for the CUDA driver API. cuda_runtime_api.h defines the public host functions and types for the CUDA runtime API cuda_runtime.h defines everything cuda_runtime_api.h does, as well as built-in type definitions

问题 The tool include-what-you-use can be used to detect unneeded headers. I am using CMake for my C++ software project. How can I instruct CMake to run include-what-you-use automatically on the source files of my software project? 回答1: CMake 3.3 introduced the new target property CXX_INCLUDE_WHAT_YOU_USE that can be set to the path of the program include-what-you-use. For instance this CMakeLists.txt cmake_minimum_required(VERSION 3.3 FATAL_ERROR) add_executable(hello main.cc) find_program(iwyu

问题 dir1 has dir2, file1.c and file1.h. dir2 has file2.c Now, if I want to access a function defined in file1.c in file2.c, I need to declare it in file1.h and include file1.h in file2.c -- is that a valid assumption? If no, please explain. If yes, even after doing that I am getting "undefined reference to function" error. file2.c:29: undefined reference to `function' collect2: ld returned 1 exit status * Error code 1 回答1: Compiling a c program happens in two steps basic steps: compiling and

问题 How a standard library like libc.a (static library) which is included using #include <stdio.h> in our main.c differ from user defined header file (cube.h) included in main.c with its implementation file (cube.c) in C ? I mean both are header files but one's implementation is a static library (.a) and others is source file (.c) . You would have the definition (implementation) in, say, cube.c #include "cube.h" int cube( int x ) { return x * x * x; } Then we'll put the function declaration in

问题 I'm trying to use openssl with visual studio c project. I compiled openssl using visual studio nmake command then installed everything to a predefined folder (C:\openssl) using: nmake install The folder structure is as following: bin include/openssl lib Inside include/openssl there are .h header files. In my Visual studio 2012, I created an empty general c++ project and included C:\openssl\include [Project properties -> C/C++ -> General -> Additional Include Directories] I also added lib

问题 When we make a class we declare its functions in a header files and define them in a source file... then the header file can be included in the main file to use the class... But if we declare a template class in header files and define it in the .cpp file and then if we include the header file in the main(containing int main) file then why does a linker error crop up... and the error does not crop up if we included the .cpp file(containing the header file ) in the main file... any answers plz

问题 I'm trying to make "a script" - essentially an awk command - to extract the prototypes of functions of C code in a .c file to generate automatically a header .h. I'm new with awk so I don't get all the details. This is a sample of the source .c : dict_t dictup(dict_t d, const char * key, const char * newval) { int i = dictlook(d, key); if (i == DICT_NOT_FOUND) { fprintf(stderr, "key \"%s\" doesn't exist.\n", key); dictdump(d); } else { strncpy(d.entry[i].val, newval, DICTENT_VALLENGTH); }