restructure doc files for readTheDocs #773
@ -550,7 +550,7 @@ Example for an oracle answering questions of type `string` with answers of type
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contract Oracles =
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stateful entrypoint registerOracle(acct : address,
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sign : signature, // Signed oracle address + contract address
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sign : signature, // Signed network id + oracle address + contract address
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qfee : int,
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ttl : Chain.ttl) : oracle(string, int) =
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Oracle.register(acct, signature = sign, qfee, ttl)
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@ -571,13 +571,13 @@ contract Oracles =
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Oracle.extend(o, ttl)
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stateful entrypoint signExtendOracle(o : oracle(string, int),
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sign : signature, // Signed oracle address + contract address
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sign : signature, // Signed network id + oracle address + contract address
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ttl : Chain.ttl) : unit =
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Oracle.extend(o, signature = sign, ttl)
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stateful entrypoint respond(o : oracle(string, int),
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q : oracle_query(string, int),
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sign : signature, // Signed oracle query id + contract address
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sign : signature, // Signed network id + oracle address + contract address
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r : int) =
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Oracle.respond(o, q, signature = sign, r)
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@ -8,7 +8,6 @@
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- [Language Features](#language-features)
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- [Contracts](#contracts)
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- [Calling other contracts](#calling-other-contracts)
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- [Protected contract calls](#protected-contract-calls)
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- [Mutable state](#mutable-state)
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- [Stateful functions](#stateful-functions)
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- [Payable](#payable)
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@ -141,36 +140,6 @@ without calling it you can write
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Chain.spend(v.address, amount)
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```
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#### Protected contract calls
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If a contract call fails for any reason (for instance, the remote contract
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crashes or runs out of gas, or the entrypoint doesn't exist or has the wrong
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type) the parent call also fails. To make it possible to recover from failures,
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contract calls takes a named argument `protected : bool` (default `false`).
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The protected argument must be a literal boolean, and when set to `true`
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changes the type of the contract call, wrapping the result in an `option` type.
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If the call fails the result is `None`, otherwise it's `Some(r)` where `r` is
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the return value of the call.
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```sophia
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contract VotingType =
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entrypoint : vote : string => unit
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contract Voter =
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entrypoint tryVote(v : VotingType, alt : string) =
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switch(v.vote(alt, protected = true) : option(unit))
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None => "Voting failed"
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Some(_) => "Voting successful"
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```
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Any gas that was consumed by the contract call before the failure stays
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consumed, which means that in order to protect against the remote contract
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running out of gas it is necessary to set a gas limit using the `gas` argument.
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However, note that errors that would normally consume all the gas in the
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transaction still only uses up the gas spent running the contract.
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### Mutable state
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Sophia does not have arbitrary mutable state, but only a limited form of
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