Enforced immutability: Difference between revisions
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Demonstrate any means your language has to prevent the modification of values, or to create objects that cannot be modified after they have been created. |
Demonstrate any means your language has to prevent the modification of values, or to create objects that cannot be modified after they have been created. |
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=={{header|6502 Assembly}}== |
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Most assemblers allow you to define labels which can refer to constant values for clarity. |
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<lang 6502asm> |
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bit7 equ %10000000 |
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bit6 equ %01000000 |
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lda #$FF |
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AND #bit7 |
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;accumulator contains #$80</lang> |
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The CPU isn't aware that these labels exist, however, as the assembler automatically replaces them with the assigned value. |
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=={{header|68000 Assembly}}== |
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Most assemblers allow you to define labels which can refer to constant values for clarity. |
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<lang 68000devpac> |
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bit7 equ %10000000 |
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bit6 equ %01000000 |
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MOVE.B (A0),D0 |
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AND.B #bit7,D0 |
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;D0.B contains either $00 or $80</lang> |
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The CPU isn't aware that these labels exist, however, as the assembler automatically replaces them with the assigned value. |
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=={{header|11l}}== |
=={{header|11l}}== |
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