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Overview
| Comment: | Add Tcl_GetWideIntFromObj() description of change. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
84e714bd8c6cb303e54def9889b4be79 |
| User & Date: | jan.nijtmans 2018-08-24 12:18:52 |
Context
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2018-08-26
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| 14:50 | CFV by DKF check-in: 4fc22720ff user: dkf tags: trunk | |
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2018-08-24
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| 12:18 | Add Tcl_GetWideIntFromObj() description of change. check-in: 84e714bd8c user: jan.nijtmans tags: trunk | |
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2018-08-23
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| 15:22 | Slight formatting, and adding a link to the related Sqlite change. check-in: cf60913448 user: jan.nijtmans tags: trunk | |
Changes
Changes to tip/514.md.
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1 % string is wide 18446744073709551615 1 % string is wide 18446744073709551616 0 </pre> So, valid wide integers appear to range from -2^64+1 to +2^64-1. Most people learn in school that 64-bit integers range from -2^63 to 2^63-1. Are Tcl's wide integers 65-bit, but then excluding -18446744073709551616? <pre> % expr int(2147483648) ; #on LP64/ILP64 platforms 2147483648 % expr int(2147483648) ; #on other platforms -2147483648 ................................................................................ * On all platforms, the int() math function is modified to do 64-bit truncation, as it already does on [LP64/ILP64](https://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models) systems (e.g. 64-bit Linux). int() will thus become synonym for wide(). The wide() function will become deprecated in Tcl 9.0, but it will not be removed yet. * The ranges of "string is integer" and "string is wideinteger" are changed to match the range of the int()/wide() math function. So these functions will report true (1) if the number is in the range -9223372036854775808..9223372036854775807. The "string is wideinteger" command will be deprecated in Tcl 9.0, but it will not be removed yet. * The C function Tcl\_GetIntFromObj() is changed to return TCL\_OK if the Tcl_Obj contains values in the range of -2147483648..4294967295. So, it succeeds if the number fits in either a platform "int", either a platform "unsigned int" type. * The C function Tcl\_GetLongFromObj() is changed to behave like Tcl\_GetIntFromObj() if sizeof(long) == sizeof(ing), and to behave like Tcl\_GetWideIntFromObj() if sizeof(long) == sizeof(Tcl_WideInt) # Implementation Currently, the proposed implementation is available in the [all-wideint branch] (https://core.tcl.tk/tcl/timeline?r=all-wideint). (WIP) # Copyright This document has been placed in the public domain. |
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1 % string is wide 18446744073709551615 1 % string is wide 18446744073709551616 0 </pre> So, valid wide integers appear to range from -(2^64-1) to +2^64-1. Most people learn in school that 64-bit integers range from -2^63 to 2^63-1. Are Tcl's wide integers 65-bit, but then excluding -18446744073709551616? <pre> % expr int(2147483648) ; #on LP64/ILP64 platforms 2147483648 % expr int(2147483648) ; #on other platforms -2147483648 ................................................................................ * On all platforms, the int() math function is modified to do 64-bit truncation, as it already does on [LP64/ILP64](https://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models) systems (e.g. 64-bit Linux). int() will thus become synonym for wide(). The wide() function will become deprecated in Tcl 9.0, but it will not be removed yet. * The ranges of "string is integer" and "string is wideinteger" are changed to match the range of the int()/wide() math function. So these functions will report true (1) if the number is in the range -9223372036854775808..9223372036854775807. The "string is wideinteger" command will be deprecated in Tcl 9.0, but it will not be removed yet. * The C function Tcl\_GetIntFromObj() is changed to return TCL\_OK if the Tcl_Obj contains a value in the range of -2147483648..4294967295. So, it succeeds if the number fits in either a platform "int", either a platform "unsigned int" type. * The C function Tcl\_GetWideIntFromObj() is changed to return TCL\_OK if the Tcl_Obj contains a value in the range of -9223372036854775808..9223372036854775807. So, it succeeds if the number fits in a Tcl_WideInt. * The C function Tcl\_GetLongFromObj() is changed to behave like Tcl\_GetIntFromObj() if sizeof(long) == sizeof(int), and to behave like Tcl\_GetWideIntFromObj() if sizeof(long) == sizeof(Tcl_WideInt) # Implementation Currently, the proposed implementation is available in the [all-wideint branch] (https://core.tcl.tk/tcl/timeline?r=all-wideint). # Copyright This document has been placed in the public domain. |