本文整理汇总了C++中Consumer::value方法的典型用法代码示例。如果您正苦于以下问题：C++ Consumer::value方法的具体用法？C++ Consumer::value怎么用？C++ Consumer::value使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Consumer的用法示例。
在下文中一共展示了Consumer::value方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: read_number
void read_number(state<Iterator, Sentinel>& ps, Consumer& consumer) {
// Any exponent larger than 511 always overflows.
static constexpr int max_double_exponent = 511;
// We assume a simple integer until proven wrong.
enum result_type_t { integer, positive_double, negative_double };
auto result_type = integer;
// Adjusts our mantissa, e.g., 1.23 becomes 123 with a dec_exp of -2.
auto dec_exp = 0;
// Exponent part of a floating point literal.
auto exp = 0;
// Our result when reading a floating point number.
auto dbl_res = 0.;
// Our result when reading an integer number.
int64_t int_res = 0;
// Computes the result on success.
auto g = caf::detail::make_scope_guard([&] {
if (ps.code <= pec::trailing_character) {
if (result_type == integer) {
consumer.value(int_res);
return;
}
// Compute final floating point number.
// 1) Fix the exponent.
exp += dec_exp;
// 2) Check whether exponent is in valid range.
if (exp < -max_double_exponent) {
ps.code = pec::exponent_underflow;
return;
}
if (exp > max_double_exponent) {
ps.code = pec::exponent_overflow;
return;
}
// 3) Scale result.
// Pre-computed powers of 10 for the scaling loop.
static double powerTable[] = {1e1, 1e2, 1e4, 1e8, 1e16,
1e32, 1e64, 1e128, 1e256};
auto i = 0;
if (exp < 0) {
for (auto n = -exp; n != 0; n >>= 1, ++i)
if (n & 0x01)
dbl_res /= powerTable[i];
} else {
for (auto n = exp; n != 0; n >>= 1, ++i)
if (n & 0x01)
dbl_res *= powerTable[i];
}
// 4) Fix sign and call consumer.
consumer.value(result_type == positive_double ? dbl_res : -dbl_res);
}
});