gvsafronov/rapidjson
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Quoted strings to String() or Key() are auto-sized by template

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No strlen call needs to be made when templates can auto-deduce the
string length. No strlen = faster!

Unfortunately this needs a touch of  SFINAE to allow multiple overrides
to coexist cleanly.
This commit is contained in:
John Stiles 2017-03-05 00:27:08 -08:00
parent 7116c355df
commit dd97ede84d
1 changed files with 15 additions and 4 deletions
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19
include/rapidjson/writer.h
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@ -16,6 +16,7 @@
#define RAPIDJSON_WRITER_H_
#include "stream.h"
#include "internal/meta.h"
#include "internal/stack.h"
#include "internal/strfunc.h"
#include "internal/dtoa.h"
@ -198,7 +199,8 @@ public:
return EndValue(WriteString(str, length));
}
bool String(const Ch* str, SizeType length, bool copy = false) {
template <typename T>
bool String(const T* str, SizeType length, bool copy = false, RAPIDJSON_ENABLEIF((internal::IsSame<Ch, T>))) {
RAPIDJSON_ASSERT(str != 0);
(void)copy;
Prefix(kStringType);
@ -217,7 +219,8 @@ public:
return WriteStartObject();
}
bool Key(const Ch* str, SizeType length, bool copy = false) { return String(str, length, copy); }
template <typename T>
bool Key(const T* str, SizeType length, bool copy = false, RAPIDJSON_ENABLEIF((internal::IsSame<Ch, T>))) { return String(str, length, copy); }
bool EndObject(SizeType memberCount = 0) {
(void)memberCount;
@ -247,8 +250,16 @@ public:
//@{
//! Simpler but slower overload.
bool String(const Ch* str) { return String(str, internal::StrLen(str)); }
bool Key(const Ch* str) { return Key(str, internal::StrLen(str)); }
template <typename T>
bool String(const T* const& str, RAPIDJSON_ENABLEIF((internal::IsSame<Ch, T>))) { return String(str, internal::StrLen(str)); }
template <typename T>
bool Key(const T* const& str, RAPIDJSON_ENABLEIF((internal::IsSame<Ch, T>))) { return Key(str, internal::StrLen(str)); }
//! The compiler can give us the length of quoted strings for free.
template <typename T, size_t N>
bool String(const T (&str)[N], RAPIDJSON_ENABLEIF((internal::IsSame<Ch, T>))) { return String(str, N-1); }
template <typename T, size_t N>
bool Key(const T (&str)[N], RAPIDJSON_ENABLEIF((internal::IsSame<Ch, T>))) { return Key(str, N-1); }
//@}