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[spec/type] Improve bool example #4360

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[spec/type] Improve bool example #4360

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9 changes: 7 additions & 2 deletions spec/type.dd
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Original file line number Diff line number Diff line change
Expand Up @@ -640,7 +640,7 @@ $(H2 $(LNAME2 bool, $(D bool)))
$(P The bool type is a byte-size type that can only hold the value `true` or
`false`.)

$(P The only operators that can accept operands of type bool are: $(CODE_AMP)
$(P The only operators that directly accept operands of type bool are: $(CODE_AMP),
$(CODE_PIPE), $(D ^), $(CODE_AMP)$(D =), $(CODE_PIPE)$(D =), $(D ^=), !,
$(CODE_AMP)$(CODE_AMP), $(CODE_PIPE)$(CODE_PIPE), and $(D ?:).)

Expand All @@ -660,8 +660,13 @@ $(UNDEFINED_BEHAVIOR)

$(SPEC_RUNNABLE_EXAMPLE_RUN
---
bool b = 1; // int literal converted to `true`
assert(b);
assert(b + b == 2); // b promoted to int

byte i = 2;
bool b = cast(bool) i; // OK, same as `i != 0`
//b = i; // Error
b = cast(bool) i; // OK, same as `i != 0`
assert(b);

bool* p = cast(bool*) &i; // unsafe cast
Expand Down