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[1] Octet and enumerated constants were added with the CORBA 23 revision, so they work only with a CORBA 23 (or later) ORB
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const float PI = 31415926; const char NUL = '\0'; const string LAST_WORDS = "My god, it's full of stars!"; const octet MSB_MASK = 0x80; enum Color { red, green, blue }; const Color FAVORITE_COLOR = green; const boolean CONTRADICTION = FALSE; // Bad idea const long ZERO = 0; // Bad idea, too
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The last two definitions are marked as bad ideas because they do not add any value to the specification (they are an example of needless aliasing and so should be avoided) Aliases for basic types can be used to define constants, so the following is legal:
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typedef short const TempType TempType; MAX_TEMP = 35; // Max temp in Celsius
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IDL supports exactly the same literals as C++ For example, integer constants can be specified in decimal, hex, or octal notation, floating-point literals use the usual C++ conventions for exponent and fraction, and character and string constants support the standard C++ escape sequences Here are some examples:
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// Integer constants const long I1 = 123; const long I2 = 0123; const long I3 = 0x123; const long I4 = 0XaB; // Floating point constants const double D1 = 50e-10; const double D2 = -314; // const double D3 = 1; const double D4 = 1; const double D5 = 1E10; const double D6 = 1E10; // Character literals const char C1 = 'c'; // const char C2 = '\007'; // const char C3 = '\x41'; // const char C4 = '\n'; // const char C5 = '\t'; // const char C6 = '\v'; // const char C7 = '\b'; // const char C8 = '\r'; // const char C9 = '\f'; // const char C10 = '\a'; // const char C11 = '\\'; // const char C12 = '\ '; // const char C13 = '\''; // // String literals const string S1 = "Quote: \""; // // // // decimal 123 octal 123, decimal 83 hexadecimal 123, decimal 291 hexadecimal ab, decimal 171
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// integer, fraction, & exponent integer part and fraction part // fraction part only // integer part only // fraction part and exponent // integer part and exponent the character c ASCII BEL, octal escape ASCII A, hex escape newline tab vertical tab backspace carriage return form feed alert backslash question mark single quote // string with double quote
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const string S2 = "hello world"; // simple string const string S3 = "hello" " world"; // concatenate const string S4 = "\xA" "B"; // two characters \ ('\xA' and 'B'), \ not the single \ character '\xAB' const string<5> BS = "Hello"; // Bounded string constant
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Note that the last four lines in this example do not contain a syntax error The preprocessor concatenates the final four lines, making the last three lines part of the preceding comment 4710 Constant Expressions IDL offers arithmetic and bitwise operators, as shown in Table 4 2 These operators are familiar from C++, but not all of them behave like their C++ counterparts
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Table 42 IDL operators Operator Type Arithmetic Bitwise Semantics for Arithmetic Operators +-*/% | & ^ < >> ~ IDL Operators
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The arithmetic operators apply to both floating-point and integer expressions with the exception of %, which must have integer operands The arithmetic operators do not support mixed-mode arithmetic You cannot mix integer and floating-point constants in the same expression, and there is no form of explicit type casting The restriction exists to keep IDL compiler implementations simple Integer expressions are evaluated as unsigned long unless a negative integer is contained in the expression, which causes evaluation as long The result is coerced back into the target type If intermediate values in the expression exceed the range of long or unsigned long or if the resulting value does not fit into the target type, the behavior is undefined Here are some examples of arithmetic constant expressions:
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const const const const short short short float MIN_TEMP MAX_TEMP AVG_TEMP TWICE_PI = = = = -10; 35; (MAX_TEMP + MIN_TEMP) / 2; 314 * 20; // Can't use 314 * 2 here
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