header-files

问题 i defined a class in header file and implemented its function in same header file. but while defining these functions i have to put inline keyword with function definition. Otherwise compiler gave compile time error. I know inline is only a hint to compiler. So why it is necessary to put inline keyword with function definition. I am using visual studio compiler with qt for compiling the code here is the code tempinline.h #ifndef TEMPINLINE_H #define TEMPINLINE_H #include "iostream" class

问题 I have a header file with a class definition and some includes. The class contains some public functions and some private variables. The class gets compiled into an executable. Lets say that somebody takes this header file and creates a "public" copy. He removes all the includes and private variables (uses forward declarations for the undefined symbols). Then he compiles his own code (which calls the public functions of the class in question) against the "public" header file and creates an

问题 In python, one can import specific feature-sets from different modules, rather than importing the whole file ex: Instead of using import math and using print math.sqrt(4) , importing the function directly: from math import sqrt print sqrt(4) And it works just fine. Where as in C and C++ , one has to include the whole header file to be able to use just one function that it provides. Such as, in C++ #include<iostream> #include<cmath> int main(){ cout<<sqrt(4); return 0; } C code will also be

问题 I noticed that when I do this : [myParser setDelegate:self]; it works :D (even if I didn't add the code in the header file ... you know, the <delegateStuff, delegateOtherStuff> in the interface declaration) When are you supposed to modify the header file to make your delegate work ? Is the setDelegate method enough to make it work ? Cheers for any help ;) Gauthier 回答1: In short, the <NSXMLParserDelegate> in your interface declaration is not required, it's there for error checking at compile

问题 I have a string.h in my project added it to my header search path with -I (because I'm using CMake and compiling from the project root directory rather than the directory where string.h is located). The project uses an external library that tries to #include <string.h> (the standard C header) in one of its header files that I include, and accidentally ends up including my string.h (because it was on the header search path that inclusion with <> uses). Here's the (edited) error message that

问题 We have a C++ library which provides a CMakeList.txt file, and it leads with the following: cmake_minimum_required(VERSION 2.8.5 FATAL_ERROR) project(cryptopp) set(cryptopp_VERSION_MAJOR 5) set(cryptopp_VERSION_MINOR 6) set(cryptopp_VERSION_PATCH 5) include(GNUInstallDirs) ... According to the CMake manual at GNUInstallDirs: Provides install directory variables as defined for GNU software... ... INCLUDEDIR - C header files (include) OLDINCLUDEDIR - C header files for non-gcc (/usr/include) ..

问题 I'm developing a iOS 6 app for iPad and I use a Repository called Grabkit, which I have to add inside my project as a nested/sub project. In order to make it work I must add in Header Search Paths the following code: $(TARGET_BUILD_DIR)/include/GrabKitLib So then it looks like that: It works pretty well in the simulator and even when I test it on my iPad, but the problem is that when I want to archive to send it to the App Store I get an error saying: "Grabkit.h file not found" I don't get

问题 Working on a project I did not initiate, I want to add an << operator to a class. Problem: the class is a private inner class of an other class, the latter being in a namespace . And I cannot make it. The problem can be simplified this way: #include <iostream> #include <map> namespace A { class B { private: typedef std::map<int, int> C; C a; friend std::ostream& operator<<(std::ostream& os, const C &c) { for (C::const_iterator p = c.begin(); p != c.end(); ++p) os << (p->first) << "->" << (p-

问题 While running a simple c program I receive an Unresolved inclusion: <conio.h> What am I missing? I am using eclipse on fedora 13 . Please help me resolve this problem. If I am missing any file or haven't installed anything let me know. Also I am new to fedora. Guide me with proper steps please. Thanks in advance. 回答1: conio.h is a C header file used in old MS-DOS compilers to create text user interfaces. It is not described in The C Programming Language book, and it is not part of the C

问题 I joined an already existing (opensource-) Qt 4 project to add some functionality. The project compiles and runs perfectly on Linux Slackware with Qt 4.8.5. As IDE I first used KDevelop (comes with Slackware), but Qt project files aren't supported in KDevelop (since it primarily uses cmake, I had to use the makefile to import the project). Now I want to switch to Qt Creator, but header files in included (relative-) paths aren't recognized. For example the project file is in "dir0/programs