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Fix handling of output iterators in format_to_n (#1506)

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This commit is contained in:
Victor Zverovich
2020-01-05 09:59:01 -10:00
parent aa07c57654
commit 9e3f3e8cff
2 changed files with 32 additions and 8 deletions
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include/fmt/format.h
+5 -8
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@@ -395,6 +395,7 @@ template <typename OutputIt> class truncating_iterator_base {
public:
using iterator_category = std::output_iterator_tag;
using value_type = typename std::iterator_traits<OutputIt>::value_type;
using difference_type = void;
using pointer = void;
using reference = void;
@@ -415,12 +416,10 @@ class truncating_iterator;
template <typename OutputIt>
class truncating_iterator<OutputIt, std::false_type>
: public truncating_iterator_base<OutputIt> {
using traits = std::iterator_traits<OutputIt>;
mutable typename traits::value_type blackhole_;
mutable typename truncating_iterator_base<OutputIt>::value_type blackhole_;
public:
using value_type = typename traits::value_type;
using value_type = typename truncating_iterator_base<OutputIt>::value_type;
truncating_iterator(OutputIt out, std::size_t limit)
: truncating_iterator_base<OutputIt>(out, limit) {}
@@ -445,13 +444,11 @@ template <typename OutputIt>
class truncating_iterator<OutputIt, std::true_type>
: public truncating_iterator_base<OutputIt> {
public:
using value_type = typename OutputIt::container_type::value_type;
truncating_iterator(OutputIt out, std::size_t limit)
: truncating_iterator_base<OutputIt>(out, limit) {}
truncating_iterator& operator=(value_type val) {
if (this->count_++ < this->limit_) this->out_ = val;
template <typename T> truncating_iterator& operator=(T val) {
if (this->count_++ < this->limit_) *this->out_++ = val;
return *this;
}