TYPPRICE computes the equal-weighted average of Open, High, and Low: $(O + H + L) \times \frac{1}{3}$. This three-component mean captures the opening price and the full intra-bar range without including the settlement (Close). By excluding Close, Typical Price isolates the session's initial positioning and range extremes, making it useful as an input where you want a price representative that is independent of closing action. The calculation is stateless and costs a single FMA instruction per bar.
The OHL3 variant of Typical Price represents the average of the bar's opening level and its range extremes. Unlike the more common HLC3 formulation (which TA-Lib implements as `TA_TYPPRICE`), OHL3 excludes the closing price entirely. This makes it suitable for analysis where the settlement price should not influence the representative price, for example when studying intra-session price discovery or when the closing price is already used as a separate signal component.
In QuanTAlib, `TBar.OHL3` provides the same value as a zero-cost computed property. The `Typprice` indicator class wraps this in the streaming `ITValuePublisher` interface with bar correction, NaN safety, and event chaining.
Division by a non-power-of-two constant is 4-5x more expensive than multiplication on modern x86 CPUs (~15 cycles vs ~3 cycles). Precomputing $\frac{1}{3}$ as a `const double` and multiplying eliminates the division entirely. The compiler constant-folds `1.0 / 3.0` to the IEEE 754 double `0x3FD5555555555555` at compile time, so the hot path sees only multiply/FMA operations.
