Unit 2 · Make AI outputs predictable

Add richer validation to your fields

You use the fluent builder for limits, nested objects, arrays, optional fields, and richer descriptions. Validation becomes part of the program instead of cleanup after it.

f()8 focused minutesNot started

Unit example (nearest native match)

See the idea in context

auto sig = axllm::s("email:string -> priority:class \"high, normal, low\"");

Reject empty input
min(1) makes the text requirement executable.
Bound the score
The output must stay between zero and one.
Build one signature
build() finishes the reusable input and output contract.

Run itIn your own project

cmake_minimum_required(VERSION 3.20)
project(ax_quick_start LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 17)

include(FetchContent)
FetchContent_Declare(axllm GIT_REPOSITORY https://github.com/ax-llm/ax GIT_TAG main SOURCE_SUBDIR packages/cpp)
FetchContent_MakeAvailable(axllm)

add_executable(quick_start quick_start.cpp)
target_link_libraries(quick_start PRIVATE axllm::axllm)

#include <axllm/axllm.hpp>
#include <cstdlib>
#include <iostream>

int main() {
  auto llm = axllm::ai("openai", axllm::object({{"apiKey", std::getenv("OPENAI_API_KEY")}}));
  auto classify = axllm::ax("review:string -> sentiment:class \"positive, negative, neutral\"");
  auto result = classify.forward(*llm, axllm::object({
    {"review", "Useful and boring in the best way."}
  }));

  auto sentiment = axllm::Core::get(result, "sentiment");
  std::cout << "sentiment: " << std::get<std::string>(sentiment.data) << "\n";
}

Set OPENAI_APIKEY in your environment before running provider-backed code.

In the ax repo

From a clone of the ax repo:

npm run example -- cpp src/examples/cpp/generation/structured_generation.cpp

Active practice

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Answer 2 in a row to learn this · attempt 1

Keep exploring

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Source-backed follow-up