← Solana theorytheory 0/100 · 0%

level 1

Curious · 0 XP

streak

perfect

badges

100 XP to Apprentice

Native Rust · medium

20. Native Rust: Manual Cross-Program Invocations

invoke and invoke_signed with Instruction and AccountInfo slices.

1 min read2 questionsup to 50 XPtopic 20/100

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

To perform a CPI natively, construct a `solana_program::instruction::Instruction` struct and call `invoke(&instruction, &[account_infos])`. For PDAs, use `invoke_signed(&instruction, &[account_infos], &[&[seeds, bump]])`.

How to study this topic

1. Read the explanation once end to end, skipping the code.
2. Re-read the code snippets and say out loud what each line does.
3. Answer the quiz without scrolling back — that is the real check.
4. Read every explanation, even for the answers you got right.

Scoring

· Up to 30 XP from quiz accuracy.
· +15 XP for a perfect first attempt.
· +5 XP while a 3-day streak is running.
· 75% or higher marks the topic complete.

Check your understanding

1. What three fields constitute a solana_program::instruction::Instruction?
program_id, accounts (Vec<AccountMeta>), and data (Vec<u8>)from, to, and amountsignature, hash, and payloadcaller, receiver, and lamports
2. Why must all AccountInfo references involved in a CPI be passed in the account_infos slice to invoke?
The runtime verifies that the calling program has access to every account passed to the calleeFor logging purposesTo calculate rentTo pay transaction fees

Badges

First light

Pass your first topic

Sharp shooter

3 perfect first-try quizzes

On a roll

Study 3 days in a row

Week warrior

Study 7 days in a row

Grinder

Earn 500 XP

Deep diver

Earn 1500 XP