How does Lambda work?

[fathom skiff]

so i was given this code and it has an error in it but in order to fix this i need to understand how exactly lambda works

[untold trench]

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[frank sandal]

wdym by that?

[fathom skiff]

velocity += std::reduce(std::execution::par, begin, end, [&](sf::Vertex const& v1, sf::Vertex const& v2)
    {
        return calcVelocityChangeFor(v1) + calcVelocityChangeFor(v2);
    });

    return velocity;

this is the full code

and this is the entire function

[halcyon viper]

I thought reduce was called std::accumulate

[frank sandal]

there's both

accumulate guarantees a certain order of evaluation while reduce doesn't

[halcyon viper]

ah

[untold trench]

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