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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
//
//===----------------------------------------------------------------------===//
// <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, 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 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 );
test ( L"ABCDE", 5 );
test ( L"a", 1 );
test ( L"", 0 );
#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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