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// This source code is released into the public domain.
module;
#include <cerrno>
export module nihil.util:save_errno;
// save_errno: save the current value of errno and restore it when we're destroyed.
// this allows wrappers around C functions that use errno to preserve the caller's
// errno value.
namespace nihil {
export struct save_errno final
{
save_errno() : m_errno(errno) {}
~save_errno()
{
errno = m_errno;
}
// Not copyable
save_errno(const save_errno&) = delete;
auto operator=(const save_errno&) -> save_errno & = delete;
// Not movable
save_errno(save_errno&&) = delete;
auto operator=(save_errno&&) -> save_errno & = delete;
private:
int m_errno;
};
} // namespace nihil
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