C++11 provides us with smart pointers, which brings us a lot of convenience.What about the assumption that unique_ptr is the element of a vector container?form the same:vectorBut how do you add elements to VEC?See below:#include#include#include usingnamespacestd;int main(){ vectorint>> vec; vec.push_back(1);//错误 return0;}First define a unique_ptr and then Push_back ():#include#include#include usingnamespacestd;int main(){ vectorint>> vec;
1. DefinitionVector2. Inserting elementsIf you want to define a = [[0,1,2],[3,4,5]], then:Correct insertion method vectorWrong insertion method vector3. LengthThe number of vector elements in vector About the use of vector
Test source#include2. Compiling3. Remove the random base address (for easy search)Instead of 04. Use Ida to open the call function in the main function5. Select address with OD load view6.call very much only look at the key to find the constructor of the vector with the object base address find something with Ida debugging with OD7. Run to the next break data followSure is CC.8. Run constructorsInitialization (STL objects have a feature the first one
Use vector containers, that is, to avoid the search, so today we list some STL find algorithm applied to the vector.
Find ()Returns an iterator to the "the" in the range [First,last] that compares equal to Val. If no such element is found, the function returns last.
#include
find_end () searches the range [first1,last1) for the "Last occurrence of" sequence defined by [ FIRST2,LAST2), and returns a i
The effect of this tutorial is somewhat similar to the vector painting effect. The production method is also relatively unique, the early stage is basically to use filters and layer mixing and so on to make similar vector color block diagram. Later refinement processing, and finally in accordance with their favorite to polish it.
Original
Final effect
1, open the original material,
Scenario: You need to automate the operation, crop the grid's range to a vector, and then crop the vector grid. Using the arcpy implementation, the code is as follows:
Import arcpy arcpy.env.workspace = ' F:/dl_data/mass_buildings/test/sat ' rasters = arcpy. Listrasters ("*", "tiff") Output_workspace = "f:/dl_data/mass_buildings/test/map_corr/ras/" for ras in rasters:img = a rcpy. Raster (RAS) ext = img.ex
Requirements
Required knowledge
This article requires a basic understanding of html and css front-end code.
Running EnvironmentStandard browser, compatible with IE7
Source code download
Font Awesome provides you with a set of scalable Font vector icons that can quickly customize the size, color, and shadow of the icons. These can be achieved through CSS, no JS code is required.
3. Use CSS to customize the Icon size, color, and shadow.
5. Supp
The data structure we implement is to solve the dynamic open-up space usage during the running process (for example, we do not know how much we enter without stopping the input)
Two principles:
I. Stupid Methods
How much space is used and how much space is opened for the first time?
The second time we use space, we will open up space B larger than the first one, copy the data in A to B, then release a, and write new data in C.
Disadvantage: copying is too many times and the efficiency is lo
Establishing equationsSet a to a point outside the line,B,c to two points in a straight line$\left\{\begin{matrix}(X-ax,y-ay) \cdot (cx-bx,cy-by) =0 \\FRAC{Y-CY}{X-CX}=\FRAC{Y-BY}{X-BX} \\end{matrix} \right.$?Solve the symbolic solutionUsing the Mathematics tool:
solve[{(x?-? Ax) * (CX?-? bx)? +? ( Y?-? ay) * (Cy?-? by)? = =???
??? 0,? (y?-? Cy) * (x?-? bx)? = =? (y?-? by) * (x?-? cx)},? {x,?y}]??
Come to the following:
{{x?->?-(bx?-? cx)? ( Ax?bx?+?ay?by?-? ax?cx?-? a
For example, I have a piece of code as follows:
Class cls_vector_item
There is no problem with this code.
When VCT. push_back (CVI);, when the internal space of VCT is insufficient, a new space will be applied and the object will be removed!
However, note that this object should have been removed, but the internal object of the object we are currently in will be removed, but it will become garbage, that is, when the VCT applies for space, the old space is destructed, but our objects are st
component mainly accesses the vector register group. In this way, the computation component can perform high-speed computation and reduce the memory size.To reduce the data transmission rate of primary storage by about 70% compared with vertical processing. Both CRAY-1 and 757 in China belong to this type.
Software and ApplicationVector Machines are generally equipped with
C + + STL provides a very powerful sorting function sort, which can sort any array, struct, and class, let's take a look at the simplest array sort. The default ascending order, we can also add less or greater to tell the compiler what sort order we want.vectorint> v = {2015927}; // Ascending order sort (V.begin (), V.end ()), Sort (V.begin (), V.end (),less int>()); // descending order sort (V.rbegin (), V.rend ()), Sort (V.begin (), v.end (), Greaterint> ());If it's a two-dimensional array, or
Document directory
Preface
1. How to implement vector
Ii. Vector class definition
3. Insert implementation in Vector
Preface
The project team should implement an algorithm library that involves the implementation of one-dimensional arrays similar to vector. Here, we will learn and understand
difficulties
Multiple map overlay Analysis is convenient
Cannot process digital image information directly
Ability to process digital image information directly
Spatial analysis is not easy to achieve
Spatial analysis is easy to do
Complex and vague boundaries are difficult to describe
Easy to describe complex, blurred boundaries
Higher cost of data output
Low technology development costs
2.5.2
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.