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Add Num.[max/min]SafeInteger (#874)

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This commit is contained in:
Chayim Refael Friedman
2021-04-08 07:45:00 +03:00
committed by GitHub
parent 61cc6cb745
commit 28da4b449c
4 changed files with 18 additions and 0 deletions
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11
doc/site/modules/core/num.markdown
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@ -35,6 +35,17 @@ The largest representable numeric value.
The smallest positive representable numeric value. The smallest positive representable numeric value.
### Num.**maxSafeInteger**
The largest integer that Wren can safely represent. It's a constant value of `9007199254740991`.
This is relevant because Wren uses double precision [floating-point format](https://en.wikipedia.org/wiki/IEEE_floating_point)
for numbers, which can only safely represent integers between <code>-(2<sup>53</sup> - 1)</code> and <code>2<sup>53</sup> - 1</code>.
### Num.**minSafeInteger**
The smallest integer Wren can safely represent. It's a constant value of `-9007199254740991`.
## Methods ## Methods
### **abs** ### **abs**

5
src/vm/wren_core.c
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@ -640,6 +640,9 @@ DEF_NUM_CONSTANT(tau, 6.28318530717958647692528676655900577)
DEF_NUM_CONSTANT(largest, DBL_MAX) DEF_NUM_CONSTANT(largest, DBL_MAX)
DEF_NUM_CONSTANT(smallest, DBL_MIN) DEF_NUM_CONSTANT(smallest, DBL_MIN)
DEF_NUM_CONSTANT(maxSafeInteger, 9007199254740991.0)
DEF_NUM_CONSTANT(minSafeInteger, -9007199254740991.0)
// Defines a primitive on Num that calls infix [op] and returns [type]. // Defines a primitive on Num that calls infix [op] and returns [type].
#define DEF_NUM_INFIX(name, op, type) \ #define DEF_NUM_INFIX(name, op, type) \
DEF_PRIMITIVE(num_##name) \ DEF_PRIMITIVE(num_##name) \
@ -1336,6 +1339,8 @@ void wrenInitializeCore(WrenVM* vm)
PRIMITIVE(vm->numClass->obj.classObj, "tau", num_tau); PRIMITIVE(vm->numClass->obj.classObj, "tau", num_tau);
PRIMITIVE(vm->numClass->obj.classObj, "largest", num_largest); PRIMITIVE(vm->numClass->obj.classObj, "largest", num_largest);
PRIMITIVE(vm->numClass->obj.classObj, "smallest", num_smallest); PRIMITIVE(vm->numClass->obj.classObj, "smallest", num_smallest);
PRIMITIVE(vm->numClass->obj.classObj, "maxSafeInteger", num_maxSafeInteger);
PRIMITIVE(vm->numClass->obj.classObj, "minSafeInteger", num_minSafeInteger);
PRIMITIVE(vm->numClass, "-(_)", num_minus); PRIMITIVE(vm->numClass, "-(_)", num_minus);
PRIMITIVE(vm->numClass, "+(_)", num_plus); PRIMITIVE(vm->numClass, "+(_)", num_plus);
PRIMITIVE(vm->numClass, "*(_)", num_multiply); PRIMITIVE(vm->numClass, "*(_)", num_multiply);

1
test/core/number/maxSafeInteger.wren Normal file
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@ -0,0 +1 @@
System.print(Num.maxSafeInteger) // expect: 9.007199254741e+15

1
test/core/number/minSafeInteger.wren Normal file
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@ -0,0 +1 @@
System.print(Num.minSafeInteger) // expect: -9.007199254741e+15