Quant Dev Technical Concepts

why C++ in quant

performance memory control and predictable execution

order book data structure

stores buy and sell orders by price levels

matching engine

system that matches compatible buy and sell orders

top of book

best bid and best ask

throughput in trading

orders processed per second

low latency focus

minimize time from input to action

benchmark

measure performance under controlled workload

cache friendliness

data layout that uses CPU cache efficiently

memory allocation cost

dynamic allocation can slow hot paths

lock contention

threads waiting on shared lock

deterministic behavior

same input gives same output

unit test for order book

verify matching cancellation and trade logs

price level

group of orders at same price

FIFO queue

first order at price gets priority

cancel order

remove open order by ID

modify order

change existing order details

trade log

record of executed matches

random order stream

generated sequence used for testing performance