# Prefixes

The library uses prefixes in names of types, constants and functions.

The main prefix is **BG** which means **B**asic **G**eometry.

The structure types have prefix in the form **Bg**. For example: *BgFP64Vector3*,
*BgFP32Versor*, *BgFP32Matrix2x2*.

The constants have prefix in the form **BG_**. For example: *BG_FP32_EPSYLON*,
*BG_FP64_TWO_PI*.

The functions have prefix in the form **bg_**. For example:
*bg_fp32_versor_combine*, *bg_fp64_matrix3x3_subtract*.

A prefix of type follows right after the prefix of the library. The library uses
two types of floating point numbers: **float** and **double** (**binary32**
and **binary64** types of the **IEEE 754** standard).

Thus there are two prefixes of types:

* **FP32** - means **F**loating **P**oint, **32** bit, which corresponds to the
**float** type of the C language.

* **FP32** - means **F**loating **P**oint, **64** bit, which corresponds to the
**double** type of the C language.

The types of structures which are based in the **float** type have **FP32** as
the type prefix: BgFP32Vector3, BgFP32Matrix3x2, BgFP32Quaternion

The types of structures which are based in the **double** type have **FP64** as
the type prefix: BgFP64Vector2, BgFP64Matrix2x3, BgFP64Versor

The constants of the **float** type have **FP32_** as the type prefix:
BG_FP32_PI, BG_FP32_EPSYLON.

The constants of the **double** type have **FP64_** as the type prefix:
BG_FP64_HALF_PI, BG_FP64_ONE_THIRD.

The functions which works with data of the **float** type have **fp32_** as
the type prefix: bg_fp32_vector2_get_module, bg_fp32_radians_to_degrees.

The functions which works with data of the **double** type have **fp64_** as
the type prefix: bg_fp64_vector3_reset, bg_fp64_radians_normalize.