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Mastering Development

AVRO schema with default array of objects

I have an AVRO schema with an array field. This array field has items being an object of another AVRO schema. Below is the code I have right now. { "name": "bars", "type": ["null", { "type": "array", "items": "com.example.Bar" }], "default": null } This code is the field definition for "bars" which is an array […]

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Cryptocurrency Ethereum Mastering Development

Cannot verify source code smart contract on Etherscan! PLEASE help me

Link for the contract on Etherscan: https://ropsten.etherscan.io/address/0x339237da476f50777da2d04b05037a805e46fcdb Arguments Type: String,String, uint8 ~ "FinanceToken", "MYFI", "18" Source code: https://github.com/financeyearn/TokenErc20/blob/main/test.sol

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Mastering Development

How to cast values to custom type in SQLAlchemy with Postgres

In the application that I’m building, I’ve used a Composite Type of Custom types to store data. It’s basically a list of simple objects of type: bin = CompositeType(columns=[Column(‘label’, String()), Column(‘head’, Float()), Column(‘tail’, Float())], name=’bin’) This is built into my class in a way such as: class Myclass(db.Model): id = sa.Column(‘id’, sa.Integer(), nullable=False) bin = […]

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Mastering Development

C++ Invalid New Expression Of Abstract Class Type

I get this error when using c++. I tried other solutions such as using a shared pointer but with no avail. Here is my code : Main.cpp: int main() { game_init(); cout << items.at(0).name << endl; while(true) game_tick(); return 0; } Item.h: #ifndef ITEM_H #define ITEM_H #include "../Rooms/Room.h" #include <string> #include <vector> #include <memory> using […]

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Mastering Development

How do DataType and Encoder interact with Spark Dataset and what is their relation?

In Spark SQL, there’re limited DataTypes for Schema, and there’re limited Encoders for converting JVM objects to and from the internal Spark SQL representation. In practice, we may have errors like this regarding DataType, which usually happens in a DataFrame with custom types, BUT NOT in a Dataset[T] with custom types. Discussion of DataType (or […]

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Mastering Development

Using globalProperties in Vue 3 and Typescript

I’ve added a global property in main.ts, and am trying to access this in a component. however I’m getting the error: Property ‘$const’ does not exist on type ‘ComponentPublicInstance<{}, {}, {}, {}, {}, EmitsOptions, {}, {}, false, ComponentOptionsBase<{}, {}, {}, {}, {}, ComponentOptionsMixin, ComponentOptionsMixin, EmitsOptions, string, {}>>’.Vetur(2339) I think I need to augment the type, […]

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Mastering Development

F# If statement type mismatch inside function

Im a relatively new F# programmer, and it seems everytime i fix one problem in my code another arises, so my issue is inside the transpose recursive function, i want to run an if-else statement inside it to check if the input is actually valid or not, however this errors and im not sure why […]

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Mastering Development

How to call Java entrypoint method with non-primitive types as parameter from c++ using graalvm

I am trying to create a shared library(dll with header and lib files) of a java code using graalvm. there will be one java method with 2 parameters of type String which I will call from c++. I am using a maven project, I am not able to create the dll out of my java […]

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Mastering Development

Reshaping a circular buffer to the thrid dimension

We can reshape a regular matrix to the third dimension using: julia> data = rand(4,2) 4×2 Array{Float64,2}: 0.89585 0.328315 0.77878 0.619666 0.232389 0.132091 0.48543 0.829476 julia> reshape(data, 4, 1, 2) 4×1×2 Array{Float64,3}: [:, :, 1] = 0.895850499952602 0.7787804133322247 0.23238945917674037 0.4854297310447009 [:, :, 2] = 0.3283154491436233 0.6196660556881552 0.13209084702809903 0.8294762758800456 But if using CircularBuffer we get an […]

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Mastering Development

How to create an Expression Parser with Tree using Struct

I have a problem I do not understand. I want to create an Expression Parser. So, first I created a tree for that parser. And this is it. enum { integer, plus, minus, multi, divis, string, character }; struct Tree { int operation; struct Tree *left; struct Tree *right; char *value; }; struct Tree *make_node(int […]