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🔨 small refactoring to improve branch coverage

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The branch coverage reported by lcov is weird. The code before and after has the same Godbolt assembler, but the code with the lambda has a better branch coverage.
This commit is contained in:
Niels Lohmann
2018-06-23 17:05:04 +02:00
parent c8bfdfd961
commit ed6a0686df
2 changed files with 34 additions and 30 deletions
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32
single_include/nlohmann/json.hpp
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@ -6041,22 +6041,24 @@ class binary_reader
// half-precision floating-point numbers in the C language
// is shown in Fig. 3.
const int half = (byte1 << 8) + byte2;
const int exp = (half >> 10) & 0x1F;
const int mant = half & 0x3FF;
double val;
if (exp == 0)
const double val = [&half]
{
val = std::ldexp(mant, -24);
}
else if (exp != 31)
{
val = std::ldexp(mant + 1024, exp - 25);
}
else
{
val = (mant == 0) ? std::numeric_limits<double>::infinity()
: std::numeric_limits<double>::quiet_NaN();
}
const int exp = (half >> 10) & 0x1F;
assert(0 <= exp and exp <= 32);
const int mant = half & 0x3FF;
assert(0 <= mant and mant <= 1024);
switch (exp)
{
case 0:
return std::ldexp(mant, -24);
case 31:
return (mant == 0)
? std::numeric_limits<double>::infinity()
: std::numeric_limits<double>::quiet_NaN();
default:
return std::ldexp(mant + 1024, exp - 25);
}
}();
return sax->number_float((half & 0x8000) != 0
? static_cast<number_float_t>(-val)
: static_cast<number_float_t>(val), "");