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corss compiler isnan

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This commit is contained in:
fo40225 2018-05-08 12:35:08 +08:00
parent 4050143288
commit 6e5e9be736
2 changed files with 22 additions and 2 deletions
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21
src/lib_json/json_writer.cpp
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@ -68,6 +68,25 @@
#define snprintf _snprintf
#endif
#if defined(_MSC_VER) && !defined(__clang__)
#if _MSC_VER >= 1900 && defined(_WIN64)
#include <math.h>
#define isnan _isnanf
#else
#include <float.h>
#define isnan _isnan
#endif
#elif __cplusplus >= 201103L
#include <cmath>
#define isnan std::isnan
#else
#include <math.h>
#if !define(isnan)
// IEEE standard states that NaN values will not compare to themselves
#define isnan(x) (x!=x)
#endif
#endif
#if defined(_MSC_VER) && _MSC_VER >= 1400 // VC++ 8.0
// Disable warning about strdup being deprecated.
#pragma warning(disable : 4996)
@ -148,7 +167,7 @@ JSONCPP_STRING valueToString(double value, bool useSpecialFloats, unsigned int p
}
} else {
// IEEE standard states that NaN values will not compare to themselves
if (isnan(value)) {
len = snprintf(buffer, sizeof(buffer), useSpecialFloats ? "NaN" : "null");
} else if (value < 0) {

3
src/test_lib_json/main.cpp
View File

@ -18,6 +18,7 @@
#include <sstream>
#include <string>
#include <iomanip>
#include <cmath>
// Make numeric limits more convenient to talk about.
// Assumes int type in 32 bits.
@ -2405,7 +2406,7 @@ JSONTEST_FIXTURE(CharReaderAllowSpecialFloatsTest, issue209) {
JSONTEST_ASSERT_STRING_EQUAL("", errs);
JSONTEST_ASSERT_EQUAL(3u, root.size());
double n = root["a"].asDouble();
JSONTEST_ASSERT(isnan(n));
JSONTEST_ASSERT(std::isnan(n));
JSONTEST_ASSERT_EQUAL(std::numeric_limits<double>::infinity(), root.get("b", 0.0));
JSONTEST_ASSERT_EQUAL(-std::numeric_limits<double>::infinity(), root.get("c", 0.0));
}