implementation

OpenCV SURF function is not implemented

由 邮差的信 提交于 2019-11-27 08:08:02
When I try to run the sample find_obj.cpp or any OpenCV SURF program I get the following error in command prompt while executing the code. The project builds without errors and warnings. I am using VS2011 beta, OpenCV 2.4 and windows7. Error message: OpenCV Error: The function/feature is not implemented < OpenCV was built without SURF support> in unknown function,file ..\..\..\src\opencv\modules\legacy\src\features2d.cpp, line 77 I tried to build the OpenCV 2.4 again using Cmake and then VS2011 in debug mode and then added the lib paths in the IDE, but still no result. How can I fix that?

Why is bounds checking not implemented in some of the languages?

由 限于喜欢 提交于 2019-11-27 08:06:59
问题 According to the Wikipedia (http://en.wikipedia.org/wiki/Buffer_overflow) Programming languages commonly associated with buffer overflows include C and C++, which provide no built-in protection against accessing or overwriting data in any part of memory and do not automatically check that data written to an array (the built-in buffer type) is within the boundaries of that array. Bounds checking can prevent buffer overflows. So, why are 'Bounds Checking' not implemented in some of the

crc16 implementation java

由 时间秒杀一切 提交于 2019-11-27 06:14:30
问题 I am having problems with calculating CRC-16 implementation of a byte array in java. Basically I am trying to send bytes to a RFID that starts writing to a tag. I can see the checksum value of array by looking tcpdump command on mac. But my goal is to generate it by myself. Here is my byte array which should generate 0xbe,0xd9: byte[] bytes = new byte[]{(byte) 0x55,(byte) 0x08,(byte) 0x68, (byte) 0x14, (byte) 0x93, (byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,

Room cannot find implementation

由 假如想象 提交于 2019-11-27 05:51:04
问题 I have a problem with testing a Room database: when I run the test, I get this exception: java.lang.RuntimeException: cannot find implementation for database.TicketDatabase. TicketDatabase_Impl does not exist at android.arch.persistence.room.Room.getGeneratedImplementation(Room.java:92) at android.arch.persistence.room.RoomDatabase$Builder.build(RoomDatabase.java:454) at com.sw.ing.gestionescontrini.DatabaseTest.setDatabase(DatabaseTest.java:36) at java.lang.reflect.Method.invoke(Native

Register an object creator in object factory

由 谁说我不能喝 提交于 2019-11-27 04:36:03
问题 I have the convenient object factory template that creates objects by their type id names. The implementation is pretty obvious: ObjectFactory contains the map from std::string to object creator function. Then all objects to be created shall be registered in this factory. I use the following macro to do that: #define REGISTER_CLASS(className, interfaceName) \ class className; \ static RegisterClass<className, interfaceName> regInFactory##className; \ class className : public interfaceName

Implementing Java Comparator

由 无人久伴 提交于 2019-11-27 02:45:08
问题 I am trying to write an algorithm which utilizes a min-priority queue, so I looked around on google and found the PriorityQueue. It seems that in order to use it, though, I am going to need to tell it how I want it to prioritize, and that the way to do this is with a comparator (I want to compare specific data fields of my "Node1" objects). More googling presented the idea of creating a new comparator which implements Comparator but overrides the compare method. What I am trying is this (and

Could somebody explain what the MERGE statement really does in Oracle?

由 扶醉桌前 提交于 2019-11-27 01:55:34
问题 I am looking for a clear explanation of what the MERGE statement in Oracle really does. Here is what I am after: MERGE INTO (target_table) t USING (source_view) s ON (join condition) WHEN MATCHED THEN UPDATE SET col1 = val1 [, ...] WHEN NOT MATCHED THEN INSERT (col1 [, ...]) VALUES ( val1 [, ...]) what kind of join is performed? I think it is full outer join, am I right? regarding the WHEN MATCHED part: what happens when a row from t matches multiple rows from s ? regarding the WHEN NOT

Where can I find useful R tutorials with various implementations?

由 旧时模样 提交于 2019-11-27 00:50:00
问题 I'm using R language and the manuals on the R site are really informative. However, I'd like to see some more examples and implementations with R which can help me develop my knowledge faster. Any suggestions? 回答1: I'll mention a few that i think are excellent resources but that i haven't seen mentioned on SO. They are all free and freely available on the Web (links supplied). Data Analysis Examples A collection of individual examples from the UCLA Statistics Dept. which you can browse by

Standard container re-allocation multipliers across popular toolchains

由 99封情书 提交于 2019-11-26 22:03:22
问题 Containers like std::basic_string and std::vector perform automatic re-allocations when internal capacity runs out. The standard specifies that, after a re-allocation, .capacity() >= .size() . What are some of the actual multipliers used by mainstream toolchains when performing re-allocations? Update So far, I have: Dinkumware: 1.5 (ships with MSVS and possibly ICC) GNU libstdc++: 2 (ships with GCC and possibly ICC) RW/Apache stdcxx: 1.618 (aka φ) STLport: 2 回答1: New answer for an old

How to change the implementation (detour) of an externally declared function

由 家住魔仙堡 提交于 2019-11-26 18:47:33
I have a third party function function DataCompare(const S1, S2: string; APartial: Boolean): Boolean; begin ... end; It is used in another third party unit. I wish to replace the body of the function at runtime with another new implementation. Is this possible? I guess there will be a need of some hack (ala VirtualMemoryUnprotect). A non-assembler solution is very welcome. RRUZ Yes you can do that, using the ReadProcessMemory and WriteProcessMemory functions to patch the code of the current process. Basically, you get the address of the procedure or function to patch and then insert a Jump
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