1*594fa147SHui Xie //===----------------------------------------------------------------------===// 2*594fa147SHui Xie // 3*594fa147SHui Xie // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*594fa147SHui Xie // See https://llvm.org/LICENSE.txt for license information. 5*594fa147SHui Xie // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*594fa147SHui Xie // 7*594fa147SHui Xie //===----------------------------------------------------------------------===// 8*594fa147SHui Xie 9*594fa147SHui Xie // UNSUPPORTED: c++03, c++11, c++14, c++17 10*594fa147SHui Xie 11*594fa147SHui Xie // Some basic examples of how drop_while_view might be used in the wild. This is a general 12*594fa147SHui Xie // collection of sample algorithms and functions that try to mock general usage of 13*594fa147SHui Xie // this view. 14*594fa147SHui Xie 15*594fa147SHui Xie #include <algorithm> 16*594fa147SHui Xie #include <cassert> 17*594fa147SHui Xie #include <ranges> 18*594fa147SHui Xie #include <string_view> 19*594fa147SHui Xie main(int,char **)20*594fa147SHui Xieint main(int, char**) { 21*594fa147SHui Xie using namespace std::string_view_literals; 22*594fa147SHui Xie std::string_view source = " \t \t \t hello there"sv; 23*594fa147SHui Xie auto is_invisible = [](const auto x) { return x == ' ' || x == '\t'; }; 24*594fa147SHui Xie auto skip_ws = std::views::drop_while(source, is_invisible); 25*594fa147SHui Xie assert(std::ranges::equal(skip_ws, "hello there"sv)); 26*594fa147SHui Xie 27*594fa147SHui Xie return 0; 28*594fa147SHui Xie } 29