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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
// <string_view>
// void remove_prefix(size_type _n)
#include <string_view>
#include <cassert>
#include "test_macros.h"
template <typename CharT>
void test(const CharT* s, std::size_t len) {
typedef std::basic_string_view<CharT> SV;
{
SV sv1(s);
assert(sv1.size() == len);
assert(sv1.data() == s);
if (len > 0) {
sv1.remove_prefix(1);
assert(sv1.size() == (len - 1));
assert(sv1.data() == (s + 1));
sv1.remove_prefix(len - 1);
}
assert(sv1.size() == 0);
sv1.remove_prefix(0);
assert(sv1.size() == 0);
}
}
#if TEST_STD_VER > 11
constexpr std::size_t test_ce(size_t n, size_t k) {
typedef std::basic_string_view<char> SV;
SV sv1{"ABCDEFGHIJKL", n};
sv1.remove_prefix(k);
return sv1.size();
}
#endif
int main(int, char**) {
test("ABCDE", 5);
test("a", 1);
test("", 0);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test(L"ABCDE", 5);
test(L"a", 1);
test(L"", 0);
#endif
#if TEST_STD_VER >= 11
test(u"ABCDE", 5);
test(u"a", 1);
test(u"", 0);
test(U"ABCDE", 5);
test(U"a", 1);
test(U"", 0);
#endif
#if TEST_STD_VER > 11
{
static_assert(test_ce(5, 0) == 5, "");
static_assert(test_ce(5, 1) == 4, "");
static_assert(test_ce(5, 5) == 0, "");
static_assert(test_ce(9, 3) == 6, "");
}
#endif
return 0;
}
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