CN103345416A - Method and system for acquiring array length - Google Patents
Method and system for acquiring array length Download PDFInfo
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- CN103345416A CN103345416A CN2013103203713A CN201310320371A CN103345416A CN 103345416 A CN103345416 A CN 103345416A CN 2013103203713 A CN2013103203713 A CN 2013103203713A CN 201310320371 A CN201310320371 A CN 201310320371A CN 103345416 A CN103345416 A CN 103345416A
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Abstract
The embodiment of the invention discloses a method and a system for acquiring array length. By adopting the method and system, the array length can be accessed through a smart pointer in C++ language, and the operation is simple. The method comprises the following steps of: acquiring array length and array type; reconstructing the smart pointer by utilizing the array length and the array type; and acquiring the array length through the smart pointer.
Description
Technical field
The present invention relates to field of computer technology, be specifically related to a kind of method and system of obtaining array length.
Background technology
C Plus Plus is a kind of Object-oriented Programming Design language, grows up on the basis of C language.A lot of java standard libraries are arranged in C Plus Plus, and it is the C++ programming function that provides the foundation.In existing C ++ in the java standard library, a kind of intelligent pointer: std::auto_ptr is provided, this intelligent pointer is mainly used in common pointer object is encapsulated and operates, particularly, in the boost storehouse of C++, provide shared_array class, array pointer is encapsulated, the operation of access array still only is provided, and the operation of not obtaining array length.Owing to do not know the length of array, when using this intelligent pointer, need remember the length of array or the length of calculating array pointer in addition, thereby bring extra code and extra central processing unit (CPU, Central Processing Unit) to consume.
Summary of the invention
At above-mentioned defective, the embodiment of the invention provides a kind of method and system of obtaining array length, can realize directly obtaining array length by intelligent pointer in C++, and is simple and convenient.
The embodiment of the invention provides a kind of method of obtaining array length, comprising:
Obtain array length and array type;
Utilize described array length and described array type that intelligent pointer is re-constructed;
Obtain described array length by intelligent pointer.
Further, described described array length and the described array type of utilizing re-constructs intelligent pointer, specifically comprises:
Described array length is saved as the value that array encapsulates the array length variable of having set in the class, so that described intelligent pointer obtains described array length by visiting described array length variable;
Create array according to described array length and described array type.
Further, describedly obtain described array length by intelligent pointer, specifically comprise:
Visit described array length variable by intelligent pointer and obtain described array length.
Further, comprise before obtaining array length and array type described:
The array length variable of described array length is set in array encapsulation class.
The embodiment of the invention also provides a kind of system that obtains array length, comprising:
Acquiring unit is used for obtaining array length and array type;
Initialization unit is used for utilizing described array length and described array type that intelligent pointer is re-constructed;
Addressed location is used for obtaining described array length by the intelligent pointer after the initialization.
Further, described initialization unit comprises:
Preserve the unit, be used for described array length is saved as the value of the array length variable that array encapsulation class set, so that described intelligent pointer obtains described array length by visiting described array length variable;
The array creating unit is used for creating array according to described array length and described array type.
Further, described addressed location comprises:
First addressed location is used for visiting described array length variable by intelligent pointer and obtains described array length.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages:
After obtaining array length and array type in the embodiment of the invention, re-construct according to this array length and array type, make intelligent pointer can directly obtain array length, compared with prior art, the embodiment of the invention can realize in C++ that intelligent pointer directly visits array length, and is simple to operate.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, to do to introduce simply to the accompanying drawing of required use in the embodiment of the invention below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of method flow diagram that obtains array length that Fig. 1 provides for the embodiment of the invention;
A kind of another process flow diagram of method that obtains array length that Fig. 2 provides for the embodiment of the invention;
A kind of system's basic structure synoptic diagram that obtains array length that Fig. 3 provides for the embodiment of the invention;
A kind of another basic structure synoptic diagram of system that obtains array length that Fig. 4 provides for the embodiment of the invention;
A kind of another basic structure synoptic diagram of system that obtains array length that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing of the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides a kind of method of obtaining array length, is used for C++ and gets access to array length by intelligent pointer.
As shown in Figure 1, the embodiment of the invention provides a kind of method of obtaining array length, comprising:
Step S10, obtain array length and array type;
Wherein, in C++, can visit array length according to intelligent pointer, at first, need obtain the relevant information of the array of required foundation from the information of user's input, this relevant information can be array length and array type.
Be understandable that array type can be character string string array, int array etc., all array types all are applicable to the embodiment of the invention.
Step S20, utilize described array length and described array type that intelligent pointer is re-constructed;
Wherein, according to the array length that gets access to and array type, utilize array encapsulation class that intelligent pointer is reconstructed and make, just carry out the establishment of actual array, in order to realize the purpose of intelligent pointer visit array length.
Step S30, obtain described array length by intelligent pointer.
Wherein, according to array length and array type, utilize on the boost::shared_pr template base of array encapsulation class intelligent being reconstructed made, and then can utilize the form of intelligent pointer visit array length variable to obtain array length.
Particularly, before above-mentioned steps S10, also comprise step: the array length variable that described array length is set in array encapsulation class.
Wherein, in array encapsulation class, the array length variable length that preserves array length is set, and can be set to public by described array length variable length, and then in whole procedure, can visit this array length variable length.
The embodiment of the invention re-constructs intelligent pointer by utilizing array length and array type, makes it possible to get access to array length by intelligent pointer, and is for C++ provides the more convenient method of obtaining array length, simple to operate.
See also Fig. 2, a kind of another process flow diagram of method that obtains array length that Fig. 2 provides for the embodiment of the invention, as shown in Figure 2, a kind of method of obtaining array length can comprise:
Be understandable that in C++, array encapsulation class is normally defined template＜class T〉class JArray, the encapsulation class of array is mainly used in array is encapsulated.As a rule, the array length of each definition can not change, and then can increase an array length variable length in the class by encapsulating in array, and this array length variable length is preserved.Particularly, the access modifier of this array length variable length is set to public public.
Simultaneously, the template class of definition intelligent pointer, template＜class AT for example〉class JPtr＜JArray＜AT 〉, this intelligent pointer can be reconstructed based on the boost::shared_pr template base of C++ array encapsulation class and make, particularly, the building method that needs heavily loaded boost::shared_pr makes intelligent pointer can accept array encapsulation class and re-constructs.
After receiving the relevant information of array, will obtain array length and array type, for example this array length will be taken as x, this array type will be taken as int.
Wherein, when utilizing intelligent pointer reception array encapsulation class to construct, concrete make is:
JPtr<int>P1（new?JArray<int>(x)）
Wherein, P1 is intelligent pointer, and array type is int, and array length is x, and x is a positive integer arbitrarily, and expression needs the length of the array of establishment.
According to above-mentioned make, at first array length x is saved as the value of the array length variable length that sets in the array encapsulation class.
Create array according to accessed array length x and array type int, the array of establishment is new int (x).
Wherein, utilize the array length variable length in the intelligent pointer visit array encapsulation class then can get access to array length, definition one new array JArray*array in program for example can be JArray*array=P1.array.length by the mode that intelligent pointer is visited this array length so.
What the embodiment of the invention was concrete is according to the array length and the array type that get access to, with the value of array length as the array length variable in the array encapsulation class, and in array encapsulation class, create array according to this array length and array type, and then can be implemented among the C++ by intelligent pointer visit array length, simple to operate.
As shown in Figure 3, the embodiment of the invention also provides a kind of system that obtains array length, can comprise:
Acquiring unit 310 is used for obtaining array length and array type;
Further, as shown in Figure 4, described initialization unit 320 comprises:
Described addressed location 330 comprises first addressed location 430, is used for visiting described array length variable by intelligent pointer and obtains described array length.
As shown in Figure 5, the system that obtains array length that the embodiment of the invention provides also comprises unit 340 is set, and is used for arranging in array encapsulation class the array length variable of described array length.
Be understandable that, acquiring unit 310 gets access to array length and array type from the array relevant information of user's input, preservation unit 410 in the initialization unit 320 is saved in the array length that gets access in the array length variable that defines in the array encapsulation class, value as the array length variable, array creating unit 420 is carried out actual number according to array length and array type again and is formed and build, addressed location then can carry out the visit of array length by intelligent pointer afterwards, gets access to array length.
As seen, after the embodiment of the invention is obtained array length and array type, re-construct according to this array length and array type, make intelligent pointer can directly obtain array length, can realize in C++ that intelligent pointer directly visits array length, simple to operate.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
More than a kind of method and system of obtaining array length provided by the present invention are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a method of obtaining array length is characterized in that, comprising:
Obtain array length and array type;
Utilize described array length and described array type that intelligent pointer is re-constructed;
Obtain described array length by intelligent pointer.
2. method according to claim 1 is characterized in that, described described array length and the described array type of utilizing re-constructs intelligent pointer, specifically comprises:
Described array length is saved as the value that array encapsulates the array length variable of having set in the class, so that described intelligent pointer obtains described array length by visiting described array length variable;
Create array according to described array length and described array type.
3. method according to claim 2 is characterized in that, describedly obtains described array length by intelligent pointer, specifically comprises:
Visit described array length variable by intelligent pointer and obtain described array length.
4. according to each described method of claim 1～3, it is characterized in that, comprise before obtaining array length and array type described:
The array length variable of described array length is set in array encapsulation class.
5. method according to claim 4 is characterized in that, the attribute of described array length variable is public public.
6. a system that obtains array length is characterized in that, comprising:
Acquiring unit is used for obtaining array length and array type;
Initialization unit is used for utilizing described array length and described array type that intelligent pointer is re-constructed;
Addressed location is used for obtaining described array length by intelligent pointer.
7. system according to claim 6 is characterized in that, described initialization unit comprises:
Preserve the unit, be used for described array length is saved as the value of the array length variable that array encapsulation class set, so that described intelligent pointer obtains described array length by visiting described array length variable;
The array creating unit is used for creating array according to described array length and described array type.
8. system according to claim 6 is characterized in that, described addressed location comprises:
First addressed location is used for visiting described array length variable by intelligent pointer and obtains described array length.
9. according to each described system of claim 6～8, it is characterized in that, also comprise the unit is set, be used for arranging in array encapsulation class the array length variable of described array length.
10. system according to claim 9 is characterized in that, the attribute of described array length variable is public public.
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| CN2013103203713A CN103345416A (en) | 2013-07-26 | 2013-07-26 | Method and system for acquiring array length |
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| CN2013103203713A CN103345416A (en) | 2013-07-26 | 2013-07-26 | Method and system for acquiring array length |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106325821A (en) * | 2015-07-07 | 2017-01-11 | Tcl集团股份有限公司 | Pointer management method and apparatus |
| CN109117142A (en) * | 2018-07-19 | 2019-01-01 | 北京理工大学 | A kind of fundamental type reconstructing method based on variable association tree |
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| US6105041A (en) * | 1996-12-12 | 2000-08-15 | Microsoft Corporation | Using three-state references to manage garbage collection of referenced objects |
| US7165237B2 (en) * | 2003-03-20 | 2007-01-16 | Microsoft Corporation | Data store for arbitrary data types with type safe storage and retrieval |
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| NOAM: "《http://download.csdn.net/detail/noam/5168506》", 22 March 2013 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106325821A (en) * | 2015-07-07 | 2017-01-11 | Tcl集团股份有限公司 | Pointer management method and apparatus |
| CN106325821B (en) * | 2015-07-07 | 2018-11-06 | Tcl集团股份有限公司 | A kind of pointer management method and device |
| CN109117142A (en) * | 2018-07-19 | 2019-01-01 | 北京理工大学 | A kind of fundamental type reconstructing method based on variable association tree |
| CN109117142B (en) * | 2018-07-19 | 2020-11-24 | 北京理工大学 | Basic type reconstruction method based on variable association tree |
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