Conservative can also mean use #define, macros and casts rather than those new fangled templates ;-) IIRC the guidelines are a reasonable compromise between re

Conservative can also mean use #define, macros and casts rather than those new fangled templates ;-) IIRC the guidelines are a reasonable compromise between recommending new 'safe' but relatively unfamiliar and tricky constructs - and sensible advice to avoid #define and macros. There are often other constraints in real time and safety critical systems - like avoiding allocations and exceptions. But these docs aren't specific avionics rules, there is an awful lot of code in a project like this that never gets onboard the airframe.