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// { dg-do run { target c++23 } }
// { dg-add-options no_pch }
#include <spanstream>
#ifndef __cpp_lib_spanstream
# error "Feature-test macro for spanstream missing in <spanstream>"
#elif __cpp_lib_spanstream != 202106L
# error "Feature-test macro for spanstream has wrong value in <spanstream>"
#endif
#include <testsuite_hooks.h>
using std::ispanstream;
using std::ospanstream;
using std::span;
void
test_input()
{
// reading input from a fixed pre-arranged character buffer
char input[] = "10 20 30";
ispanstream is{span<char>{input}};
int i;
is >> i;
VERIFY(10 == i);
is >> i;
VERIFY(20 == i);
is >> i;
VERIFY(30 == i);
is >>i;
VERIFY(!is);
}
void
test_output()
{
// writing to a fixed pre-arranged character buffer
char output[30]{}; // zero-initialize array
ospanstream os{span<char>{output}};
os << 10 << 20 << 30;
auto const sp = os.span();
VERIFY(6 == sp.size());
VERIFY("102030" == std::string(sp.data(), sp.size()));
VERIFY(static_cast<void*>(output) == sp.data()); // no copying of underlying data!
VERIFY("102030" == std::string(output)); // initialization guaranteed NUL termination
}
int main()
{
test_input();
test_output();
}
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