void testInteger (IntType in)
{
std::string s;
IntType out (in+1);
expect (lexicalCastChecked (s, in));
expect (lexicalCastChecked (out, s));
expect (out == in);
}
bool tryEdgeCase (std::string const& s)
{
T ret;
bool const result = lexicalCastChecked (ret, s);
if (!result)
return false;
return s == std::to_string (ret);
}
bool isNumeric (std::string const& s)
{
int n;
// Must be convertible to an integer
if (!lexicalCastChecked (n, s))
return false;
// Must not have leading zeroes
return std::to_string (n) == s;
}
bool chopUInt (int& value, int limit, std::string& input)
{
// Must not be empty
if (input.empty ())
return false;
auto left_iter = std::find_if_not (input.begin (), input.end (),
[](std::string::value_type c)
{
return std::isdigit (c, std::locale::classic());
});
std::string item (input.begin (), left_iter);
// Must not be empty
if (item.empty ())
return false;
int n;
// Must be convertible to an integer
if (!lexicalCastChecked (n, item))
return false;
// Must not have leading zeroes
if (std::to_string (n) != item)
return false;
// Must not be out of range
if (n < 0 || n > limit)
return false;
input.erase (input.begin (), left_iter);
value = n;
return true;
}
void testZero ()
{
testcase ("zero conversion");
{
std::int32_t out;
expect (lexicalCastChecked (out, "-0"), "0");
expect (lexicalCastChecked (out, "0"), "0");
expect (lexicalCastChecked (out, "+0"), "0");
}
{
std::uint32_t out;
expect (!lexicalCastChecked (out, "-0"), "0");
expect (lexicalCastChecked (out, "0"), "0");
expect (lexicalCastChecked (out, "+0"), "0");
}
}
void tryBadConvert (std::string const& s)
{
T out;
expect (!lexicalCastChecked (out, s), s);
}
