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Compute StringRef size in ctor

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This commit is contained in:
Victor Zverovich 2014-10-30 07:05:42 -07:00
parent 10d83aaa52
commit 5c4b6678e4
1 changed files with 10 additions and 8 deletions
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18
format.h
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@ -164,15 +164,20 @@ template <typename Char>
class BasicStringRef { class BasicStringRef {
private: private:
const Char *data_; const Char *data_;
mutable std::size_t size_; std::size_t size_;
public: public:
/** /**
Constructs a string reference object from a C string and a size. Constructs a string reference object from a C string and a size.
If *size* is zero, which is the default, the size is computed
automatically.
*/ */
BasicStringRef(const Char *s, std::size_t size = 0) : data_(s), size_(size) {} BasicStringRef(const Char *s, std::size_t n) : data_(s), size_(n) {}
/**
Constructs a string reference object from a C string computing
the size with ``std::char_traits<Char>::length``.
*/
BasicStringRef(const Char *s)
: data_(s), size_(std::char_traits<Char>::length(s)) {}
/** /**
Constructs a string reference from an `std::string` object. Constructs a string reference from an `std::string` object.
@ -195,10 +200,7 @@ class BasicStringRef {
/** /**
Returns the string size. Returns the string size.
*/ */
std::size_t size() const { std::size_t size() const { return size_; }
if (size_ == 0 && data_) size_ = std::char_traits<Char>::length(data_);
return size_;
}
friend bool operator==(BasicStringRef lhs, BasicStringRef rhs) { friend bool operator==(BasicStringRef lhs, BasicStringRef rhs) {
return lhs.data_ == rhs.data_; return lhs.data_ == rhs.data_;