mirror of
https://github.com/fmtlib/fmt.git
synced 2024-11-02 11:28:20 +00:00
Fallback to ecvt if _ecvt_s is not available.
This commit is contained in:
parent
c1a8dfe555
commit
3a2f91bd58
68
format.h
68
format.h
@ -215,6 +215,22 @@ inline uint32_t clzll(uint64_t x) {
|
||||
# define FMT_ASSERT(condition, message) assert((condition) && message)
|
||||
#endif
|
||||
|
||||
namespace fmt {
|
||||
namespace internal {
|
||||
template <typename T = void>
|
||||
struct Null {};
|
||||
}
|
||||
}
|
||||
|
||||
// Dummy implementations of signbit and _ecvt_s called if corresponding system
|
||||
// functions are not available. These methods are in the namespace fmt_system
|
||||
// rather than fmt::internal to make sure they don't hide the potential
|
||||
// overloads in the std namespace.
|
||||
namespace fmt_system {
|
||||
inline fmt::internal::Null<> signbit(...) { return fmt::internal::Null<>(); }
|
||||
inline fmt::internal::Null<> _ecvt_s(...) { return fmt::internal::Null<>(); }
|
||||
}
|
||||
|
||||
namespace fmt {
|
||||
|
||||
// Fix the warning about long long on older versions of GCC
|
||||
@ -579,42 +595,38 @@ class FixedBuffer : public fmt::Buffer<Char> {
|
||||
void grow(std::size_t size);
|
||||
};
|
||||
|
||||
template <typename T = void>
|
||||
struct Null {};
|
||||
|
||||
// Dummy implementations of signbit and _ecvt_s called if corresponding system
|
||||
// functions are not available.
|
||||
inline Null<> signbit(...) { return Null<>(); }
|
||||
inline Null<> _ecvt_s(...) { return Null<>(); }
|
||||
|
||||
// Portable version of signbit.
|
||||
inline int getsign(double x) {
|
||||
class SignBit {
|
||||
private:
|
||||
double value_;
|
||||
struct SignBit {
|
||||
double value;
|
||||
|
||||
explicit SignBit(double val) : value(val) {}
|
||||
|
||||
int handle(int result) { return result; }
|
||||
|
||||
int handle(fmt::internal::Null<>) {
|
||||
if (value_ < 0) return 1;
|
||||
if (value_ == value_) return 0;
|
||||
int dec = 0, sign = 0;
|
||||
int handle(Null<>) {
|
||||
if (value < 0) return 1;
|
||||
if (value == value) return 0;
|
||||
|
||||
struct Ecvt {
|
||||
double value;
|
||||
int sign;
|
||||
int dec;
|
||||
explicit Ecvt(double val) : value(val), sign(0), dec(0) {}
|
||||
void handle(int) {}
|
||||
void handle(Null<>) { ecvt(value, 0, &dec, &sign); }
|
||||
} e(value);
|
||||
char buffer[2]; // The buffer size must be >= 2 or _ecvt_s will fail.
|
||||
_ecvt_s(buffer, sizeof(buffer), value_, 0, &dec, &sign);
|
||||
return sign;
|
||||
}
|
||||
|
||||
public:
|
||||
SignBit(double value) : value_(value) {}
|
||||
|
||||
int call() {
|
||||
// When compiled in C++11 mode signbit is no longer a macro but a
|
||||
// function defined in namespace std and the macro is undefined.
|
||||
using namespace std;
|
||||
return handle(signbit(value_));
|
||||
using namespace fmt_system;
|
||||
e.handle(_ecvt_s(buffer, sizeof(buffer), value, 0, &e.dec, &e.sign));
|
||||
return e.sign;
|
||||
}
|
||||
};
|
||||
return SignBit(x).call();
|
||||
// When compiled in C++11 mode signbit is no longer a macro but a
|
||||
// function defined in namespace std and the macro is undefined.
|
||||
using namespace std;
|
||||
using namespace fmt_system;
|
||||
return SignBit(x).handle(signbit(x));
|
||||
}
|
||||
|
||||
#ifndef _MSC_VER
|
||||
|
Loading…
Reference in New Issue
Block a user