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[libc++] Adds a test for std::fill_n. 

The function `std::fill` requires a ForwardIterator, but `std::fill_n`
only requires an OutputIterator. Adds a test to validate `std::fill_n`
works with an OutputIterator.

Noticed this while working on LWG3539
format_to must not copy models of output_iterator<const charT&>

Reviewed By: #libc, Quuxplusone, ldionne

Differential Revision: https://reviews.llvm.org/D117395
This commit is contained in:
Mark de Wever 2022-01-15 13:48:54 +01:00
parent a9f713f5ac
commit 8f4a6187f2
1 changed files with 30 additions and 31 deletions
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61
libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
View File

@ -39,38 +39,37 @@ template <class Iter>
void
test_char()
{
const unsigned n = 4;
char ca[n] = {0};
assert(std::fill_n(Iter(ca), UDI(n), char(1)) == std::next(Iter(ca), n));
assert(ca[0] == 1);
assert(ca[1] == 1);
assert(ca[2] == 1);
assert(ca[3] == 1);
char a[4] = {};
Iter it = std::fill_n(Iter(a), UDI(4), char(1));
assert(base(it) == a + 4);
assert(a[0] == 1);
assert(a[1] == 1);
assert(a[2] == 1);
assert(a[3] == 1);
}
template <class Iter>
void
test_int()
{
const unsigned n = 4;
int ia[n] = {0};
assert(std::fill_n(Iter(ia), UDI(n), 1) == std::next(Iter(ia), n));
assert(ia[0] == 1);
assert(ia[1] == 1);
assert(ia[2] == 1);
assert(ia[3] == 1);
int a[4] = {};
Iter it = std::fill_n(Iter(a), UDI(4), 1);
assert(base(it) == a + 4);
assert(a[0] == 1);
assert(a[1] == 1);
assert(a[2] == 1);
assert(a[3] == 1);
}
void
test_int_array()
{
const unsigned n = 4;
int ia[n] = {0};
assert(std::fill_n(ia, UDI(n), static_cast<char>(1)) == std::next(ia, n));
assert(ia[0] == 1);
assert(ia[1] == 1);
assert(ia[2] == 1);
assert(ia[3] == 1);
int a[4] = {};
assert(std::fill_n(a, UDI(4), static_cast<char>(1)) == a + 4);
assert(a[0] == 1);
assert(a[1] == 1);
assert(a[2] == 1);
assert(a[3] == 1);
}
struct source {
@ -83,13 +82,12 @@ struct source {
void
test_int_array_struct_source()
{
const unsigned n = 4;
int ia[n] = {0};
assert(std::fill_n(ia, UDI(n), source()) == std::next(ia, n));
assert(ia[0] == 0);
assert(ia[1] == 1);
assert(ia[2] == 2);
assert(ia[3] == 3);
int a[4] = {};
assert(std::fill_n(a, UDI(4), source()) == a + 4);
assert(a[0] == 0);
assert(a[1] == 1);
assert(a[2] == 2);
assert(a[3] == 3);
}
struct test1 {
@ -101,9 +99,8 @@ struct test1 {
void
test_struct_array()
{
const unsigned n = 4;
test1 test1a[n] = {0};
assert(std::fill_n(test1a, UDI(n), static_cast<char>(10)) == std::next(test1a, n));
test1 test1a[4] = {};
assert(std::fill_n(test1a, UDI(4), static_cast<char>(10)) == test1a + 4);
assert(test1a[0].c == 11);
assert(test1a[1].c == 11);
assert(test1a[2].c == 11);
@ -150,11 +147,13 @@ void test6()
int main(int, char**)
{
test_char<output_iterator<char*> >();
test_char<forward_iterator<char*> >();
test_char<bidirectional_iterator<char*> >();
test_char<random_access_iterator<char*> >();
test_char<char*>();
test_int<output_iterator<int*> >();
test_int<forward_iterator<int*> >();
test_int<bidirectional_iterator<int*> >();
test_int<random_access_iterator<int*> >();