uuid_v4 | Super fast C++ library to generate and parse UUIDv4 | Identity Management library
kandi X-RAY | uuid_v4 Summary
kandi X-RAY | uuid_v4 Summary
This is a fast C++ header-only library to generate, serialize, print and parse UUIDs version 4 variant 1 as specified in RFC-4122. It heavily relies on SIMD operations (instruction sets SSE4.1/AVX/AVX2), c++11 PRNG library and some c++17 features. This library generates UUIDs with pseudo-random numbers, seeded by true (hardware) random. It is not a cryptographically secure way of generating UUIDs.
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uuid_v4 Key Features
uuid_v4 Examples and Code Snippets
Lines of Code : 30License : Permissive (MIT)
Copy#include "uuid_v4"
UUIDv4::UUIDGenerator uuidGenerator;
UUIDv4::UUID uuid = uuidGenerator.getUUID();
std::string bytes = uuid.bytes();
or
std::string bytes1;
uuid.bytes(bytes1);
or
char bytes2[16];
uuid.bytes(bytes2);
std::string s = uuid.str();
or git clone --recurse-submodules https://github.com/crashoz/uuid_v4.git
git clone https://github.com/crashoz/uuid_v4.git
mkdir build
cd build
cmake -Dtest=ON -Dbenchmark=ON ..
make
./tests/uuid_v4_test
./benchmarks/uuid_v4_benchmark
Community Discussions
Trending Discussions on uuid_v4
QUESTION
the error is currEmot is possibly undefined. I'm confused why that is occurring because the for loop is guaranteed to loop through the emotionsObject and add objects to the map.
...ANSWER
Answered 2021-Nov-11 at 01:12use bang operator ! to tell typescript that there will be no situation where object is not found
QUESTION
Javas UUID class implements Comparable. But the order it implements appears to be incompatible with the specificiation given in RFC 4122.
In particular, it is inconsistent with the natural order implied by its string representation (uuid1.toString().compareTo(uuid2.toString())), which lines up with the RFC.
You can reproduce and observe the problem by using the following code:
...ANSWER
Answered 2021-Nov-02 at 18:25Well, in one case you compare UUIDs, in another case two string in lexical order.
According to the Javadoc:
The first of two UUIDs is greater than the second if the most significant field in which the UUIDs differ is greater for the first UUID.
QUESTION
I have 2 pages both are childrens from App.
_ NavbarComp.js
_ Home.js
Right now I have a functionnal SearchBar in my Home, I'd like to pass the values between NavbarComp & Home.
When I search from my NavbarComp, I'd like to have a render only on the Home page.
This is what it looks like so far.
I now need to remove my input button from Home, and pass the values between both pages Navbar & Home.
I dont think I can use props there, tho.. looking for solutions !
NavbarComp.js
...ANSWER
Answered 2021-Sep-09 at 13:50I can see three ways that you can implement to resolve this.
The first one is creating a context, so your state is going to be share through all your app. So when you change it inside your NavbarComp you will be able to get this value in another component.
The second one is similar to context but using redux. I saw that you are using redux in your project, you can share those values through redux.
The other way is to create a useState() inside your app component and pass it as props to your NavbarComp and your home. So this state will be shared between those two.
QUESTION
Using:
- PostgreSQL 11 with
uuid_generate_v4type - Symfony 4.4.11
- Api Platform 2.5.6
I have an Entity with the following Id :
...ANSWER
Answered 2020-Aug-07 at 06:41This behaviour is DBMS specific, so you have to add your own logic.
The API-Platform component which retrieve an entity given an ID is the ItemDataProviderInterface.
- First, I will declare a new exception
MalformedUuidException. - Next, I will convert this exception to a 400 error.
- Finally, I will create a new ItemDataProviderInterface implementation, wrapping the ORM one and adding some checks to the ID:
QUESTION
I have a query like this
...ANSWER
Answered 2020-Apr-06 at 21:12As said in comments, if you are getting collisions with UUID with just a million rows (yes, just) that's because your random uuid generation is using some weak random generator.
Since you now posted your uuid_v4() function, and it relies on MySQL rand(), I can explain why your code is failing.
According to mysql docs: http://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html
RAND() is not meant to be a perfect random generator. It is a fast way to generate random numbers on demand that is portable between platforms for the same MySQL version.
This means that you can't use mysql to generate your uuid, at least not with RAND() function.
You will need to generate the uuid outside mysql of possible. There's a few libraries for it in many languages:
- PHP: https://github.com/ramsey/uuid
- Java: https://www.baeldung.com/java-uuid
- Javascript: https://www.npmjs.com/package/uuid
Always check if the library you choose uses a Cryptographically-safe random generator.
UPDATEIt's possible to generate safe UUID V4 on MySQL side using random_bytes() function:
This function returns a binary string of len random bytes generated using the random number generator of the SSL library.
So we can update your function to:
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