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Fix compilation on platforms with exotic double (#878)

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This commit is contained in:
Victor Zverovich 2018-09-26 08:45:34 -07:00
parent e4ca37ccf6
commit d7f17613f5
3 changed files with 18 additions and 5 deletions
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9
include/fmt/format-inl.h
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@ -513,7 +513,8 @@ FMT_FUNC void grisu2_gen_digits(
}
}
FMT_FUNC void grisu2_format_positive(double value, char *buffer, size_t &size,
template <typename Double>
FMT_FUNC void grisu2_format_positive(Double value, char *buffer, size_t &size,
int &dec_exp) {
FMT_ASSERT(value > 0, "value is nonpositive");
fp fp_value(value);
@ -640,8 +641,10 @@ FMT_FUNC void grisu2_prettify(char *buffer, size_t &size, int exp,
// Formats a nonnegative value using Grisu2 algorithm. Grisu2 doesn't give any
// guarantees on the shortness of the result.
FMT_FUNC void grisu2_format(double value, char *buffer, size_t &size, char type,
int precision, bool write_decimal_point) {
template <typename Double>
FMT_FUNC typename std::enable_if<sizeof(Double) == sizeof(uint64_t)>::type
grisu2_format(Double value, char *buffer, size_t &size, char type,
int precision, bool write_decimal_point) {
FMT_ASSERT(value >= 0, "value is negative");
int dec_exp = 0; // K in Grisu.
if (value > 0) {

9
include/fmt/format.h
View File

@ -293,8 +293,13 @@ inline bool use_grisu() {
// Formats value using Grisu2 algorithm:
// https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf
FMT_API void grisu2_format(double value, char *buffer, size_t &size, char type,
int precision, bool write_decimal_point);
template <typename Double>
FMT_API typename std::enable_if<sizeof(Double) == sizeof(uint64_t)>::type
grisu2_format(Double value, char *buffer, size_t &size, char type,
int precision, bool write_decimal_point);
template <typename Double>
inline typename std::enable_if<sizeof(Double) != sizeof(uint64_t)>::type
grisu2_format(Double, char *, size_t &, char, int, bool) {}
template <typename Allocator>
typename Allocator::value_type *allocate(Allocator& alloc, std::size_t n) {

5
test/format-impl-test.cc
View File

@ -102,6 +102,11 @@ TEST(FPTest, GetCachedPower) {
}
}
TEST(FPTest, Grisu2FormatCompilesWithNonIEEEDouble) {
size_t size = 0;
fmt::internal::grisu2_format(4.2f, FMT_NULL, size, 0, 0, false);
}
template <typename T>
struct ValueExtractor: fmt::internal::function<T> {
T operator()(T value) {