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locale_facets.tcc (num_put::_M_convert_float): Extend comment, reduce __cs_size for non-fixed outputs.

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2001-12-07  Paolo Carlini  <pcarlini@unitus.it>

	* include/bits/locale_facets.tcc (num_put::_M_convert_float):
	Extend comment, reduce __cs_size for non-fixed outputs.

From-SVN: r47767
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Paolo Carlini 2001-12-07 20:00:07 +01:00 committed by Paolo Carlini
parent 9975c6d428
commit 46d360629c
2 changed files with 11 additions and 2 deletions
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5
libstdc++-v3/ChangeLog
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@ -1,3 +1,8 @@
2001-12-07 Paolo Carlini <pcarlini@unitus.it>
* include/bits/locale_facets.tcc (num_put::_M_convert_float):
Extend comment, reduce __cs_size for non-fixed outputs.
2001-12-07 Paolo Carlini <pcarlini@unitus.it>
* include/bits/basic_string.tcc (_M_mutate): Fix typo

8
libstdc++-v3/include/bits/locale_facets.tcc
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@ -762,9 +762,13 @@ namespace std
// Consider the possibility of long ios_base::fixed outputs
const bool __fixed = __io.flags() & ios_base::fixed;
const int __max_exp = numeric_limits<_ValueT>::max_exponent10;
// XXX Why + 4? Why * 4? What's going on? Who's on first?
// ios_base::fixed outputs may need up to __max_exp+1 chars
// for the integer part + up to __max_digits chars for the
// fractional part + 3 chars for sign, decimal point, '\0'. On
// the other hand, for non-fixed outputs __max_digits*3 chars
// are largely sufficient.
const int __cs_size = __fixed ? __max_exp + __max_digits + 4
: __max_digits * 4;
: __max_digits * 3;
char* __cs = static_cast<char*>(__builtin_alloca(__cs_size));
int __len;