org.luaj.vm2.lib

类 MathLib

java.lang.Object

org.luaj.vm2.Varargs

org.luaj.vm2.LuaValue

org.luaj.vm2.LuaFunction

org.luaj.vm2.lib.LibFunction

org.luaj.vm2.lib.TwoArgFunction

org.luaj.vm2.lib.MathLib

直接已知子类:

JseMathLib

public class MathLib
extends TwoArgFunction

Subclass of LibFunction which implements the lua standard math library.

It contains only the math library support that is possible on JME. For a more complete implementation based on math functions specific to JSE use JseMathLib. In Particular the following math functions are not implemented by this library:

• acos
• asin
• atan
• cosh
• log
• sinh
• tanh
• atan2

The implementations of exp() and pow() are constructed by hand for JME, so will be slower and less accurate than when executed on the JSE platform.

Typically, this library is included as part of a call to either JsePlatform.standardGlobals() or org.luaj.vm2.lib.jme.JmePlatform#standardGlobals()

 
 Globals globals = JsePlatform.standardGlobals();
 System.out.println( globals.get("math").get("sqrt").call( LuaValue.valueOf(2) ) );
  

When using JsePlatform as in this example, the subclass JseMathLib will be included, which also includes this base functionality.

To instantiate and use it directly, link it into your globals table via LuaValue.load(LuaValue) using code such as:

 
 Globals globals = new Globals();
 globals.load(new JseBaseLib());
 globals.load(new PackageLib());
 globals.load(new MathLib());
 System.out.println( globals.get("math").get("sqrt").call( LuaValue.valueOf(2) ) );
  

Doing so will ensure the library is properly initialized and loaded into the globals table.

This has been implemented to match as closely as possible the behavior in the corresponding library in C.

另请参阅:

LibFunction, JsePlatform, org.luaj.vm2.lib.jme.JmePlatform, JseMathLib, Lua 5.2 Math Lib Reference

嵌套类概要

嵌套类

限定符和类型	类和说明
protected static class	MathLib.BinaryOp
protected static class	MathLib.UnaryOp

字段概要

字段

限定符和类型	字段和说明
static MathLib	MATHLIB Pointer to the latest MathLib instance, used only to dispatch math.exp to tha correct platform math library.

从类继承的字段 org.luaj.vm2.lib.LibFunction

name, opcode

从类继承的字段 org.luaj.vm2.LuaFunction

s_metatable

从类继承的字段 org.luaj.vm2.LuaValue

ADD, BAND, BNOT, BOR, BXOR, CALL, CONCAT, DIV, EMPTYSTRING, ENV, EQ, FALSE, IDIV, INDEX, LE, LEN, LT, METATABLE, MINUSONE, MOD, MODE, MUL, NEWINDEX, NIL, NILS, NONE, NOVALS, ONE, POW, SHL, SHR, SUB, TBOOLEAN, TFUNCTION, TINT, TLIGHTUSERDATA, TNIL, TNONE, TNUMBER, TOSTRING, TRUE, TSTRING, TTABLE, TTHREAD, TUSERDATA, TVALUE, TYPE_NAMES, UNM, uservalue, ZERO

构造器概要

构造器

构造器和说明
MathLib() Construct a MathLib, which can be initialized by calling it with a modname string, and a global environment table as arguments using call(LuaValue, LuaValue).

方法概要

限定符和类型	方法和说明
LuaValue	call(LuaValue modname, LuaValue env) Perform one-time initialization on the library by creating a table containing the library functions, adding that table to the supplied environment, adding the table to package.loaded, and returning table as the return value.
static double	dpow_d(double a, double b)
protected static double	dpow_default(double a, double b) Default JME version computes using longhand heuristics.
double	dpow_lib(double a, double b) Hook to override default dpow behavior with faster implementation.
static LuaValue	dpow(double a, double b) compute power using installed math library, or default if there is no math library installed

从类继承的方法 org.luaj.vm2.lib.TwoArgFunction

call, call, call, invoke

从类继承的方法 org.luaj.vm2.lib.LibFunction

bind, bind, call, newupe, newupl, newupn, tojstring

从类继承的方法 org.luaj.vm2.LuaFunction

checkfunction, classnamestub, getfenv, getmetatable, isfunction, name, optfunction, setfenv, strvalue, type, typename

从类继承的方法 org.luaj.vm2.LuaValue

add, add, add, and, arg, arg1, argerror, argerror, aritherror, aritherror, arithmt, arithmtwith, assert_, band, band, bnot, bor, bor, buffer, bxor, bxor, call, callmt, checkboolean, checkclosure, checkdouble, checkglobals, checkint, checkinteger, checkjstring, checklong, checkmetatag, checknotnil, checknumber, checknumber, checkstring, checktable, checkthread, checkuserdata, checkuserdata, compareerror, compareerror, comparemt, concat, concat, concatmt, concatTo, concatTo, concatTo, div, div, div, divInto, eq_b, eq, eqmtcall, equals, error, get, get, get, gettable, getuservalue, gt_b, gt_b, gt_b, gt, gt, gt, gteq_b, gteq_b, gteq_b, gteq, gteq, gteq, idiv, idiv, illegal, inext, initupvalue1, invoke, invoke, invoke, invoke, invoke, invokemethod, invokemethod, invokemethod, invokemethod, invokemethod, invokemethod, isboolean, isclosure, isint, isinttype, islong, isnil, isnumber, isstring, istable, isthread, isuserdata, isuserdata, isvalidkey, jcall, jget, jset, len, lenerror, length, listOf, listOf, load, lt_b, lt_b, lt_b, lt, lt, lt, lteq_b, lteq_b, lteq_b, lteq, lteq, lteq, metatableOf, metatag, method, method, method, method, method, method, mod, mod, mod, modFrom, mul, mul, mul, narg, neg, neq_b, neq, next, not, onInvoke, optboolean, optclosure, optdouble, optint, optinteger, optjstring, optlong, optnumber, optstring, opttable, optthread, optuserdata, optuserdata, optvalue, or, pow, pow, pow, powWith, powWith, presize, raweq, raweq, raweq, raweq, raweq, rawget, rawget, rawget, rawlen, rawset, rawset, rawset, rawset, rawset, rawset, rawset, rawsetlist, set, set, set, set, set, set, set, setmetatable, settable, setuservalue, shl, shl, shr, shr, strcmp, strcmp, strongvalue, sub, sub, sub, subargs, subFrom, subFrom, tableOf, tableOf, tableOf, tableOf, tableOf, tableOf, tailcallOf, testfor_b, toboolean, tobyte, tochar, todouble, tofloat, toint, tolong, tonumber, toshort, tostring, toString, touserdata, touserdata, typerror, unimplemented, userdataOf, userdataOf, valueOf, valueOf, valueOf, valueOf, valueOf, valueOf, valueOf, varargsOf, varargsOf, varargsOf, varargsOf, varargsOf, varargsOf

从类继承的方法 org.luaj.vm2.Varargs

argcheck, checkboolean, checkclosure, checkdouble, checkfunction, checkint, checkinteger, checkjstring, checklong, checknotnil, checknumber, checkstring, checktable, checkthread, checkuserdata, checkuserdata, checkvalue, dealias, eval, isfunction, isnil, isnoneornil, isnumber, isstring, istable, isTailcall, isthread, isuserdata, isvalue, optboolean, optclosure, optdouble, optfunction, optint, optinteger, optjstring, optlong, optnumber, optstring, opttable, optthread, optuserdata, optuserdata, optvalue, toboolean, tobyte, tochar, todouble, tofloat, toint, tojstring, tolong, toshort, touserdata, touserdata, type

从类继承的方法 java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细资料

MATHLIB

public static MathLib MATHLIB

Pointer to the latest MathLib instance, used only to dispatch math.exp to tha correct platform math library.

构造器详细资料

MathLib

public MathLib()

Construct a MathLib, which can be initialized by calling it with a modname string, and a global environment table as arguments using call(LuaValue, LuaValue).

方法详细资料

call

public LuaValue call(LuaValue modname,
                     LuaValue env)

Perform one-time initialization on the library by creating a table containing the library functions, adding that table to the supplied environment, adding the table to package.loaded, and returning table as the return value.

指定者:

call 在类中 TwoArgFunction

参数:

modname - the module name supplied if this is loaded via 'require'.

env - the environment to load into, typically a Globals instance.

返回:

First return value (this(arg1,arg2)), or LuaValue.NIL if there were none.

另请参阅:

LuaValue.call(), LuaValue.call(LuaValue), LuaValue.call(LuaValue, LuaValue, LuaValue), LuaValue.invoke(LuaValue, Varargs), LuaValue.method(String,LuaValue,LuaValue), LuaValue.method(LuaValue,LuaValue,LuaValue)

dpow

public static LuaValue dpow(double a,
                            double b)

compute power using installed math library, or default if there is no math library installed

dpow_d

public static double dpow_d(double a,
                            double b)

dpow_lib

public double dpow_lib(double a,
                       double b)

Hook to override default dpow behavior with faster implementation.

dpow_default

protected static double dpow_default(double a,
                                     double b)

Default JME version computes using longhand heuristics.