c400e16a58
So far, type-name strings for class template instantiations were constructed in QMetaTypeId::qt_metatype_id() by concatenating various bits and pieces into a QVarLengthArray<char>, presumably to avoid the dynamic memory allocation for small strings. Yet, when passing the result to qRegisterNormalisedMetaType, which takes a QByteArray, the QVarLengthArray was copied from, not by QByteArray::fromRawData(), but by QByteArray(const char*,int), which unconditionally results in a dynamic memory allocation after all. What's worse: the characters are copied twice: First into the QVarLengthArray, and then into the QByteArray. Remove the first of these copies by using QByteArray+reserve() to copy directly into the final QByteArray. Change-Id: Id915798a318fe97279a7cc0aca176544f99c7e86 Reviewed-by: Olivier Goffart <ogoffart@woboq.com>