The following uses the wireless network solution of a small and medium-sized hotel as an example.
Currently, the competition in the hotel industry has shifted from hardware competition to service competition. All hotels have racked their brains to improve their service awareness and level. As a four-or five-star hotel, how to provide new services to customers has become a headache for hotel operators. Over the past two years, with the increase of busi
In the past few days, when I write a program, I accidentally delete the intermediate compilation file, and then the c1083 compilation error occurs.
Xxx. cpp
.. \ Commen \ XXX. cpp (2): Fatal error c1083: Unable to open the pre-compiled header file: "Release \ XXX. PCH": no such file or directory
After searching for a long time on the Internet, the solution is roughly as follows: Change [Create/use compilation header] to "do not use compilation Header"
xcodebuild this line of command.using the CCache cacheThe most natural idea is to use the cache, since Apple's cache is not reliable, then find a reliable cache, such as CCache. It is based on the compiler level of the cache, according to the current feedback situation, there is no problem of cache inconsistency. According to the author's experiment, the use of CCache really can increase the packaging speed significantly, delete the cache and use CCache recompile, it takes only more than 10 min
Introduction to project documents
Create a new project with 3 folders on the left
The 1th folder contains all the code files and data files related to the project.
Supportingfiles contains configuration files and other data files
The final ui-tests folder is mainly used for unit testing, we do not use it at this time, so we do not consider it first.
Info.plist files, configuration information files for projects
P
are not in a hurry to answer.First Look, Stdafx.cpp file:
Stdafx.cpp: Source files//test.pch that include only standard include files
will
contain precompiled type information as precompiled Headers//stdafx.obj
#include "stdafx.h"
//TODO: In STDAFX. H
//reference any required additional header files, not referenced in this file
This only contains the library file, no operation, it is what to do with it.In ReadMe.txt, we see this passage:
Other standard documents:StdAfx.h, StdAfx.cp
One: Why Xcode6 does not automatically create Precompile Prefix HeaderWhen we write the project, most of the macro definitions, the header file import are in the Precompile Prefix header file. In Xcode 4, 5 of the template project can see the precompile Prefix Header, but in Xcode 6 was castrated, the reason can refer to the following link:Http://stackoverflow.com/questions/24158648/why-isnt-projectname-prefix-pch-created-automatically-in-xcode-6The m
tells the compiler not to hold a temporary copy of a variable. It can be applied to basic types.For example, int, char, long... also applies to the structure of C and the class of C ++. When the structure or Class Object is modified using volatile, all the members of the structure or class are considered volatile. Using volatile does not contradict the need for synchronization objects such as CRITICAL_SECTION, Mutex, and Event.For example:
Int I;I = I + 3;In any case, I will always be placed in
keyword.This deficiency. There is a busy loop in this function (the so-called busy loop is also called Busy waits, which is a high waste of CPU time)
Void getkey (char * PCH){While (* PCH = 0);}
CompileProgram, The following results will be obtained (assembly code); While (* PCH = 0)$ L27; Load the address stored in PCHMoV eax, dword ptr _
tells the compiler not to hold a temporary copy of a variable. It can be applied to basic types.For example, Int, Char, long... also applies to the structure of C and the class of C ++. When the structure or Class Object is modified using volatile, all the members of the structure or class are considered volatile. Using volatile does not contradict the need for synchronization objects such as critical_section, mutex, and event.For example:
Int I;I = I + 3;In any case, I will always be placed in
1. What is a pre-compiled header?
The pre-compiled header is physically and normally used. OBJ files are the same, but are compiled into the pre-compilation header. H ,. C ,. the CPP file is compiled only once during the entire compilation process. If the part involved in the pre-compilation header is not changed, this part will not be re-compiled during subsequent compilation. This greatly improves the compilation speed and facilitates the management of the first-class files. It also helps prev
1. What is a pre-compiled header?
The pre-compiled header is physically and normally used. OBJ files are the same, but are compiled into the pre-compilation header. H ,. C ,. the CPP file is compiled only once during the entire compilation process. If the part involved in the pre-compilation header is not changed, this part will not be re-compiled during subsequent compilation. This greatly improves the compilation speed and facilitates the management of the first-class files. It also helps prev
correct the volatile keyword.This deficiency. There is a busy loop in this function (the so-called busy loop is also called Busy waits, which is a high waste of CPU time)
Void getkey (char * PCH){While (* PCH = 0);}
After you close all the optimization options in the VC development environment, compile the program and obtain the following results (assembly code)
; While (*
keyword applies to rows rather than rows.
Let's first implement a simple function to observe the deficiencies in the compilation code generated by the compiler, and to observe how the volatile keyword fixes the deficiency. There is a busy loop in this function (the so-called busy loop is also called Busy waits, which is a high waste of CPU time)
Void getkey (char * PCH){While (* PCH = 0);}
After you close
Introduction
Standard Application Framework extensions header file pre-compilation refers to the use of some MFC standard header files (such as Windows) in a project. h. afxwin. h) pre-compilation. Later, this header file will not be compiled and only the pre-compilation results will be used. This will speed up compilation and save time. The precompiled header file is generated by compiling stdafx. cpp and named after the project name. Because the precompiled header file is suffixed with "
arithmetic operations can only be done in registers. Generally speaking, volatitle
Keywords apply between rows and rows, not within a row.
Let's first implement a simple function to look at the deficiencies in the assembly code generated by the compiler and see how the volatile keyword corrects this shortcoming. There is a busy loop in the body of the function (the so-called busy loop is also called busy waits, a cyclic method that is highly wasteful of CPU time)
Copy Code code as follow
out" like a restaurant "!
It is called "Swan Love", a couples theme hotel in guanggu.
More expensive, more popular
Use GPS to find the gray building near guanggu chuangye Street, which is called guanggu Times Square. In front of the building, the conspicuous signboard of multiple hotels is scanned, but I couldn't find the hotel named "Swan love.
Find the elevator in the building, which is hidden on the 7th floor. The building is still under construct
processing.
When a # import command is run during preprocessing, the line is replaced with all the content of the imported header file. Pre-compilation will do this recursively, even if it may be a large number of header files.
The header file of UIKit, UIKit. h, contains all other header files contained in the UIKit framework. This means that you do not have to manually import the header files of each framework, such as UIViewController. h and UIView. h UIButton. h.
Are you curious about the s
Header file pre-compilation refers to some of the MFC standard header files used in a project (such as Windows. h. afxwin. h) pre-compilation. Later, this header file will not be compiled and only the pre-compilation results will be used. This will speed up compilation and save time.
I. Pre-compiled header file description
Header file pre-compilation refers to some of the MFC standard header files used in a project (such as Windows. h. afxwin. h) pre-compilation. Later, this header file will
Document directory
01. Hotel Luxury World
02. Palms
03. Luxe Hotels
04. Bellagio
05. Grand Hotel Tremezzo
06. Hotel La Rocca
07. Corinthia
08. Hotel The Plaza
09. Bauer Hotels
10. Kiwi Collection
11. Rose Wood Hotels
12. Hotel En Convento
13. Capella Hotels
14. Stein Lodge
15. Sofitel
16. Splendia
17
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