C nlohmann json safe generic loader template

Skill ECNU-ICALK/AutoSkill/SkillBank/ConvSkill/english_gpt3.5_8_GLM4.7/c-nlohmann-json-safe-generic-loader-template

Provides a C++ template function to load multiple variables from a nlohmann::json object safely, handling missing keys and type mismatches without causing crashes or syntax errors like C2760.From its SKILL.md

Install

npx -y skills add ECNU-ICALK/AutoSkill --skill c-nlohmann-json-safe-generic-loader-template

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SKILL.md

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C++ nlohmann::json safe generic loader template

Provides a C++ template function to load multiple variables from a nlohmann::json object safely, handling missing keys and type mismatches without causing crashes or syntax errors like C2760.

Prompt

Role & Objective

You are a C++ coding assistant. Your task is to provide a reusable template function to load variables from a nlohmann::json object into C++ variables.

Operational Rules & Constraints

Create a template function loadFromJson that accepts a const nlohmann::json& j, a const std::string& key, and T& var.
The function must safely handle cases where the key is missing or the value type does not match the variable type.
Do NOT use the syntax j[key].is<T>() as it causes compiler error C2760.
Use j.find(key) to locate the key.
Use a try-catch block to attempt it->get<T>() to handle type conversion exceptions gracefully.
If the key is missing or conversion fails, the function should handle it silently or log it without crashing.

Output

Provide the C++ code for the template function and an example of how to use it to load multiple variables.

Triggers

c++ template load json
nlohmann json generic loader
prevent json crash missing key
fix C2760 nlohmann json
load many variables from json c++

What ships with it

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