Returns the size of the view if the view is bounded.

For the definitions of/*advanceable*/ and/*is-integer-like*/, seeadvanceable andis-integer-like respectively.

[edit]Return value

If any ofW andBound is not ainteger-like type, returnsto-unsigned-like (bound_ - value_ ).

Otherwise, returns(value_ <0)?
    (
        (bound_ <0)?
            to-unsigned-like (-value_ )- to-unsigned-like (-bound_ ):
            to-unsigned-like (bound_ )+ to-unsigned-like (-value_ )
    ):
    to-unsigned-like (bound_ )- to-unsigned-like (value_ ).

[edit]Example

#include <cassert>#include <ranges> int main(){unsigned initial_value{1}, bound{5};auto i{std::views::iota(initial_value, bound)};assert(i.size()== bound- initial_value and i.size()==4); auto u{std::views::iota(8)};// assert(u.size()); // Error: size() is not present since “u” is unbounded}

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit]See also

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