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💥 implemented new handling of NaN and INF #70 #329 #388

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- If an overflow occurs during parsing a number from a JSON text, an
exception (std::out_of_range for the moment, to be replaced by a
user-defined exception #244) is thrown so that the overflow is detected
early and roundtripping is guaranteed.
- NaN and INF floating-point values can be stored in a JSON value and
are not replaced by null. That is, the basic_json class behaves like
double in this regard (no exception occurs). However, NaN and INF are
serialized to “null”.
- Adjusted test cases appropriately.
This commit is contained in:
Niels Lohmann
2017-03-12 18:38:05 +01:00
parent 9355f05888
commit 8feaf8dc94
8 changed files with 100 additions and 46 deletions
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24
src/json.hpp
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@ -263,16 +263,8 @@ struct external_constructor<value_t::number_float>
template<typename BasicJsonType>
static void construct(BasicJsonType& j, typename BasicJsonType::number_float_t val) noexcept
{
// replace infinity and NAN by null
if (not std::isfinite(val))
{
j = BasicJsonType{};
}
else
{
j.m_type = value_t::number_float;
j.m_value = val;
}
j.m_type = value_t::number_float;
j.m_value = val;
j.assert_invariant();
}
};
@ -6653,6 +6645,13 @@ class basic_json
*/
void dump_float(number_float_t x)
{
// NaN / inf
if (not std::isfinite(x) or std::isnan(x))
{
o.write("null", 4);
return;
}
// special case for 0.0 and -0.0
if (x == 0)
{
@ -11425,11 +11424,10 @@ basic_json_parser_74:
result.m_type = value_t::number_float;
result.m_value = val;
// replace infinity and NAN by null
// throw in case of infinity or NAN
if (not std::isfinite(result.m_value.number_float))
{
result.m_type = value_t::null;
result.m_value = basic_json::json_value();
JSON_THROW(std::out_of_range("number overflow: " + get_token_string()));
}
return true;