Types - Revision history

Wormbo: Undo revision 46196 by SeriousBarbie (talk) there's more than just @ to concatinate strings, but this page isn't for operators

2015-08-29T05:57:36Z

Undo revision 46196 by SeriousBarbie (talk) there's more than just @ to concatinate strings, but this page isn't for operators

SeriousBarbie: +operator '@'

2015-08-28T20:00:43Z

+operator '@'

Eliot: /* Name */ Hyphen are also allowed.

2013-03-11T20:09:24Z

‎Name: Hyphen are also allowed.

WGH: /* Map */

2013-01-27T18:05:30Z

‎Map

Eliot: /* Multi-dimensional arrays */ typo.

2012-11-01T18:59:25Z

‎Multi-dimensional arrays: typo.

Wormbo: /* Composite types */ no multi-dim arrays

2012-11-01T17:08:42Z

‎Composite types: no multi-dim arrays

Krillin6 at 07:02, 5 January 2012

2012-01-05T07:02:05Z

Wormbo: /* String */ only literals are limited + details about 'button'

2011-05-05T16:45:48Z

‎String: only literals are limited + details about 'button'

Eliot: /* String */ About button

2010-09-14T20:33:37Z

‎String: About button

Wormbo: /* String */ "button" alias

2010-08-09T07:04:53Z

‎String: "button" alias

@@ Line 31: / Line 31: @@
 UnrealScript has a character string data type called '''string'''. Strings can contain any combination of [[wp:Unicode|Unicode]] characters.
-[[Literals#Strings|String literals]] are enclosed in double quotes and may not extends past the end of a line. Two or more strings can be concatenated by the operator '@'.
+[[Literals#Strings|String literals]] are enclosed in double quotes and may not extends past the end of a line. Technically string literals (but not values) are allowed to have a length of up to 1023 characters. Internally strings are zero-terminated, which means no string can contain the null character because it would be recognized as the end of the string.
 Technically string literals (but not values) are allowed to have a length of up to 1023 characters. Internally strings are zero-terminated, which means no string can contain the null character because it would be recognized as the end of the string.
 String values are immutable and UnrealScript neither provides "character" type nor allows direct access to individual string characters. There are, however, functions for extracting substrings and returning the Unicode value of the first character of a string. There's also a function for returning a string of length 1 containing a character corresponding to a specified Unicode value.

@@ Line 31: / Line 31: @@
 UnrealScript has a character string data type called '''string'''. Strings can contain any combination of [[wp:Unicode|Unicode]] characters.
-[[Literals#Strings|String literals]] are enclosed in double quotes and may not extends past the end of a line. Technically string literals (but not values) are allowed to have a length of up to 1023 characters. Internally strings are zero-terminated, which means no string can contain the null character because it would be recognized as the end of the string.
+[[Literals#Strings|String literals]] are enclosed in double quotes and may not extends past the end of a line. Two or more strings can be concatenated by the operator '@'.
 String values are immutable and UnrealScript neither provides "character" type nor allows direct access to individual string characters. There are, however, functions for extracting substrings and returning the Unicode value of the first character of a string. There's also a function for returning a string of length 1 containing a character corresponding to a specified Unicode value.

@@ Line 42: / Line 42: @@
 The data type '''name''' is a very unusual one. To the programmer it appears a lot like a case-insensitive string with very limited character set. Every object and every class has a name, but names are also used for a variety of other things, such as identifying [[states]], code [[labels]], trigger events or bones of a [[skeletal mesh]].
-[[Literals#Names|Name literals]] are enclosed in single quotes and may contain the letters A to Z, both upper and lowercase, the numbers 0 to 9, the underscore character _ and the space character. Names are limited to a length of up to 63 characters.
+[[Literals#Names|Name literals]] are enclosed in single quotes and may contain the letters A to Z, both upper and lowercase, the numbers 0 to 9, the underscore character _, the hyphen character -, and the space character. This could be represented in [[wp:regular expression|regex]] as <code>([a-zA-Z0-9_\- ]*)</code>. Names are limited to a length of up to 63 characters.
 Internally names are represented as int values, which makes sense since names are used in many places and would take up a lot of space if represented as strings. At runtime, the first mentioned string representation of a name is stored in the global name table. Whenever a name value is to a string through [[typecasting]], the string representation from the name table is used. This means that even though you could use the name literal <code>'cOnTrOlLeR'</code> in your code, it would most likely be represented by the string <code>Controller</code> instead, because that's the spelling used for the name of the class with that name.

← Older revision		Revision as of 18:05, 27 January 2013
Line 112:		Line 112:

	===Map===		===Map===
−	~~{{main\|Map}}~~
	See [[wp:Associative_array\|Associative array]], [[wp:Map_(C%2B%2B)\|C++ Map]] and [http://www.google.be/search?q=c%23+dictionary C# Dictionary].		See [[wp:Associative_array\|Associative array]], [[wp:Map_(C%2B%2B)\|C++ Map]] and [http://www.google.be/search?q=c%23+dictionary C# Dictionary].

@@ Line 109: / Line 109: @@
 ===Multi-dimensional arrays===
 {{main|multi-dimensional arrays}}
-Multi-dimensional and jagged arrays are not supported in UnrealScript. You can work around that either using an array of structs that contain an array or my performing index arithmetics on any kind of one-dimensional array.
+Multi-dimensional and jagged arrays are not supported in UnrealScript. You can work around that either by using an array of [[structs]] that contain an array or by performing index arithmetics on any kind of one-dimensional array.
 ===Map===

← Older revision		Revision as of 17:08, 1 November 2012
Line 106:		Line 106:

	In [[Unreal Engine 1]], dynamic arrays can be declared, but there's no way to access them. Only starting with [[Unreal Engine 3]], dynamic arrays of type bool can be used. (You can declare dynamic bool arrays in Unreal Engine 2, but they don't work.) It is not possible to directly use a dynamic array type in other static or dynamic arrays. It is possible to wrap other arrays or bool variables in a struct type and create a dynamic array of that struct type, though. Function parameters that are dynamic arrays may not be optional. There are no literals for dynamic arrays.		In [[Unreal Engine 1]], dynamic arrays can be declared, but there's no way to access them. Only starting with [[Unreal Engine 3]], dynamic arrays of type bool can be used. (You can declare dynamic bool arrays in Unreal Engine 2, but they don't work.) It is not possible to directly use a dynamic array type in other static or dynamic arrays. It is possible to wrap other arrays or bool variables in a struct type and create a dynamic array of that struct type, though. Function parameters that are dynamic arrays may not be optional. There are no literals for dynamic arrays.
		+
		+	===Multi-dimensional arrays===
		+	{{main\|multi-dimensional arrays}}
		+	Multi-dimensional and jagged arrays are not supported in UnrealScript. You can work around that either using an array of structs that contain an array or my performing index arithmetics on any kind of one-dimensional array.

	===Map===		===Map===

@@ Line 22: / Line 22: @@
 UnrealScript has a [[wp:single precision|single precision]] [[wp:floating point|floating point]] type called '''float'''. The possible float values are distributed over the huge range of about 3.403·10<sup>38</sup> to -3.403·10<sup>38</sup>. The smallest possible value greater than 0 is about 1.175·10<sup>-38</sup>. Generally, float values have a precision of about 6 or 7 decimal digits.
-[[Literals#Float numbers|Float literals]] can either be specified in decimal or scientific notation. For example the literal 1.2e3 means 1.2·10<sup>3</sup> = 1230. Note that float literals must always contain the decimal point, even when using scientific notation, and must always start with a number or with the minus sign followed by a number. Unfortunately, negative exponents are not allowed in scientific notation. A hexadecimal representation like in Java is not supported.
+[[Literals#Float numbers|Float literals]] can either be specified in decimal or scientific notation. For example the literal 1.2e3 means 1.2·10<sup>3</sup> = 1200. Note that float literals must always contain the decimal point, even when using scientific notation, and must always start with a number or with the minus sign followed by a number. Unfortunately, negative exponents are not allowed in scientific notation. A hexadecimal representation like in Java is not supported.
 If a floating point operation has a result that exceeds the highest or lowest possible number, the return value has the special value of positive or negative infinity respectively. Invalid operations such as division by zero or adding positive and negative infinity return the special value ''NaN'', "Not a Number". Be careful about those three special values as they will propagate. That means, if you subtract, add, multiply or divide infinity values, the result will be infinity again. If you perform an operation with the ''NaN'' value, the result will either be ''NaN'' again or (for comparison operators) something totally unexpected. For example if you perform the operation <code>a = x / 0</code>, variable a will contain ''NaN''. Now the comparison <code>a == a</code> will actually return the value ''false''! Unlike ''NaN'', infinity values will behave as expected if used in comparison operations, that is positive infinity is greater than any other value, negative infinity is smaller than any other value.

@@ Line 31: / Line 31: @@
 UnrealScript has a character string data type called '''string'''. Strings can contain any combination of [[wp:Unicode|Unicode]] characters.
-[[Literals#Strings|String literals]] are enclosed in double quotes and may not extends past the end of a line. Technically string literals are allowed to have a length of up to 1023 characters. Internally strings are zero-terminated, which means no string can contain the null character because it would be recognized as the end of the string.
+[[Literals#Strings|String literals]] are enclosed in double quotes and may not extends past the end of a line. Technically string literals (but not values) are allowed to have a length of up to 1023 characters. Internally strings are zero-terminated, which means no string can contain the null character because it would be recognized as the end of the string.
 String values are immutable and UnrealScript neither provides "character" type nor allows direct access to individual string characters. There are, however, functions for extracting substrings and returning the Unicode value of the first character of a string. There's also a function for returning a string of length 1 containing a character corresponding to a specified Unicode value.
@@ Line 37: / Line 37: @@
 Very early builds of [[Unreal Engine 1]] had a fixed-length string type, which was declared with the syntax <code>string[''length'']</code>. This type is no longer supported and only mentioned here in case you run into its declaration in old code snippets.
-In [[Unreal Engine 2]] (or at least [[UT2004]]) there also is a type called '''button''' that is an alias for the standard string type, but implies the [[Cache]] modifier.
+In [[Unreal Engine 2]] (or at least [[UT2004]]) there also is an undocumented type called '''button''' that is an alias for the standard string type, but implies the [[Cache]] variable modifier. It is not actually used in stock code and there's no reason for you to ever declare a variable with the ''cache'' modifier, so this is purely informative.
 ===Name===

← Older revision		Revision as of 07:04, 9 August 2010
Line 36:		Line 36:

	Very early builds of [[Unreal Engine 1]] had a fixed-length string type, which was declared with the syntax <code>string[''length'']</code>. This type is no longer supported and only mentioned here in case you run into its declaration in old code snippets.		Very early builds of [[Unreal Engine 1]] had a fixed-length string type, which was declared with the syntax <code>string[''length'']</code>. This type is no longer supported and only mentioned here in case you run into its declaration in old code snippets.
		+
		+	In [[Unreal Engine 2]] (or at least [[UT2004]]) there also is a type called '''button''' that seems to be an alias for the standard string type.

	===Name===		===Name===