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refactor: reserve capacity in aggregate (#2568)

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This commit is contained in:
Jeremy Rubin 2019-02-13 02:41:29 -08:00 committed by hashmap
parent 91cca2bf61
commit 563c674700
1 changed files with 12 additions and 5 deletions
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17
core/src/core/transaction.rs
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@ -1000,15 +1000,22 @@ pub fn aggregate(mut txs: Vec<Transaction>) -> Result<Transaction, Error> {
} else if txs.len() == 1 {
return Ok(txs.pop().unwrap());
}
let mut n_inputs = 0;
let mut n_outputs = 0;
let mut n_kernels = 0;
for tx in txs.iter() {
n_inputs += tx.body.inputs.len();
n_outputs += tx.body.outputs.len();
n_kernels += tx.body.kernels.len();
}
let mut inputs: Vec<Input> = vec![];
let mut outputs: Vec<Output> = vec![];
let mut kernels: Vec<TxKernel> = vec![];
let mut inputs: Vec<Input> = Vec::with_capacity(n_inputs);
let mut outputs: Vec<Output> = Vec::with_capacity(n_outputs);
let mut kernels: Vec<TxKernel> = Vec::with_capacity(n_kernels);
// we will sum these together at the end to give us the overall offset for the
// transaction
let mut kernel_offsets: Vec<BlindingFactor> = vec![];
let mut kernel_offsets: Vec<BlindingFactor> = Vec::with_capacity(txs.len());
for mut tx in txs {
// we will sum these later to give a single aggregate offset
kernel_offsets.push(tx.offset);