Programming

Questions about C#, Python, Java, algorithms, and code architecture.

ProgrammingHow to Debug Slow CMake Configuration with VCPKG on RHEL8

Learn effective cmake configuration debugging techniques to identify and resolve slow CMake configuration times when using VCPKG on RHEL8. Systematic approach with tracing and monitoring tools.

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ProgrammingRust HashMap Lifetimes: Why Query Must Outlive Map

Learn why Rust requires query lifetimes to outlive HashMap lifetimes in rust programming. Understand rust borrow checker behavior and implicit lifetime bounds.

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ProgrammingFastAPI WebSocket Cookie Dependency Injection: Why It Fails and How to Fix It

Learn why FastAPI's dependency injection can't access cookies in WebSocket endpoints and discover multiple solutions for proper cookie handling in FastAPI WebSockets.

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ProgrammingFix PowerShell Array Sorting: Numeric Sort for Nested Arrays

Learn how to fix PowerShell's incorrect sorting behavior for nested integer arrays. Discover workarounds using script blocks, type casting, and best practices for proper numeric sorting.

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ProgrammingDiscord Embed with Button on Same Line Opens Modal

Learn how to place text and buttons on the same line in Discord embeds. Create interactive bot messages where clicking buttons opens modal windows for user input.

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ProgrammingHow to Check if a Column Exists in Pandas DataFrame

Learn multiple methods to check if a column exists in Pandas DataFrame and conditionally add columns based on column verification.

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ProgrammingPython Mouse Automation with QR Code Trigger

Learn how to create a Python script that automates mouse clicks at specific screen coordinates triggered by QR code scanning using PyAutoGUI and pyzbar.

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ProgrammingResolve Git 'Would Clobber Existing Tag' Error When Pulling

Learn how to resolve Git 'would clobber existing tag' error when pulling tags. Discover safe solutions beyond force-pulling or recloning your repository.

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ProgrammingCreating Generic Type Instances in Java: Solutions Beyond Reflection

Explore practical approaches for creating instances of generic types in Java, including Class<T> parameters, factory patterns, and supplier interfaces as alternatives to reflection-based solutions.

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ProgrammingOptimize WPF Drawing for Fast Panning/Zooming Large Datasets

Fix slow WPF custom drawing in C# during panning and zooming with thousands of points/lines. Use DrawingVisual, StreamGeometry batching, viewport culling, freezing, and transforms to achieve WinForms/Qt speeds.

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ProgrammingWiX Toolset: Change MSI Uninstall Product GUID Key?

In WiX Toolset v5/v6, can you change MSI uninstall registry key from Product GUID to custom name like 'MyApp'? No, per MSI standards, but customize DisplayName and use registry query workarounds for wix msi uninstall handling.

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ProgrammingJava 8 Parallel vs Sequential Streams: Performance Guide

Learn when to use Java 8 parallel vs sequential streams for optimal performance. Discover key factors like dataset size, operation complexity, and hardware considerations.

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ProgrammingLine Breaks in Markdown Presentations: TeX ewline Equivalent

Learn how to add line breaks in markdown presentations with the TeX ewline equivalent. Discover the two-space method, HTML `<br>` tags, and backslash approach for different presentation frameworks.

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ProgrammingPHP Foreach Index: How to Access Key in Loop

Learn how to access the index or key in a PHP foreach loop using `foreach ($array as $key => $value)`. Perfect for numeric and associative arrays without manual counters. Examples, pitfalls, and tips included.

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ProgrammingCheck if Key Exists in std::map C++: find & contains

Learn how to check if a key exists in std::map using find, contains (C++20), count, and fix equal_range errors. Avoid operator[] inserts with code examples and best practices for C++ map lookups.

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ProgrammingFix Eclipse CDT Invalid Arguments for Dear ImGui

Resolve Eclipse CDT 'Invalid arguments' errors for Dear ImGui functions like ImGui_ImplOpenGL3_NewFrame() in Makefile projects. Add impl files, define macros, rebuild index for perfect indexing.

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ProgrammingWhy sub esp,8 After stdcall Call But Not Cdecl?

Understand why compilers generate 'sub esp, 8' after stdcall calls but not cdecl in unoptimized x86 assembly. Explains stack frame management, ret 8 vs ret, and calling conventions differences for debugging.

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ProgrammingFix NSHostingView SwiftUI Drag Gestures macOS Tahoe 26.2

Resolve NSHostingView not receiving SwiftUI drag gestures or mouse events behind another layer on macOS Tahoe 26.2. Custom subclass, hit-testing fixes, and double-wrapping for AppKit/SwiftUI hybrids on M1 Pro.

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ProgrammingPython Subscriptable Objects: Built-in Types & Indexing Guide

Learn what subscriptable means in Python, which built-in types support indexing operations, and how to check if objects support [] syntax with __getitem__.

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ProgrammingRuby Exclamation Marks in Method Names: Purpose and Convention

Learn about the purpose of exclamation marks in Ruby method names, differences between bang and non-bang methods, and best practices for using them in Ruby programming.

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