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transform_view::size | ||||
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constexprauto size() requiresranges::sized_range<V>; | (1) | (since C++20) |
constexprauto size()const requiresranges::sized_range<const V>; | (2) | (since C++20) |
Returns the number of elements. Equivalent toranges::size(base_).
Contents |
The number of elements.
IfV does not modelforward_range,size() might not be well-defined after a call tobegin().
#include <cassert>#include <cctype>#include <iostream>#include <ranges>#include <string> int main(){std::string s{"The length of this string is 42 characters"};auto to_upper{[](unsignedchar c)->char{returnstd::toupper(c);}};auto tv{std::ranges::transform_view{s, to_upper}};for(assert(tv.size()==42);constauto c: tv)std::cout<< c;}
Output:
THE LENGTH OF THIS STRING IS 42 CHARACTERS
(C++20) | returns an integer equal to the size of a range (customization point object)[edit] |
(C++20) | returns a signed integer equal to the size of a range (customization point object)[edit] |
