A Vector of FontMetrics

ofmrew

I have in the .h

QFont font0{"Times", 20};
QFont font1{"Times", 15};
QFont font2{"Times", 11};
QFont font3{"Times", 8};
QFontMetrics fm0{font0};
QFontMetrics fm1{font1};
QFontMetrics fm2{font2};
QFontMetrics fm3{font3};
QVector<eqnlist> list;
QVector<QFont> vfonts;
QVector<QFontMetrics> vfm;

And in the .cpp

vfonts.append(font0);
vfonts.append(font1);
vfonts.append(font2);
vfonts.append(font3);
vfm.append(fm0);

The creation of the vector of fonts works, but the vector of fontmetrics get a compilation error at line 320 in vector.h. No matching QFontMetrics::QFontMetrics. (This would be simpler if I could copy the error message.)

I know I must be doing something stupid, but I do not see it?

VRonin

QVector<T> requires T to be default-constructable due to QVector::reserve. You can use QList<QFontMetrics> instead

mrjj

@ofmrew said in A Vector of FontMetrics:

This would be simpler if I could copy the error message.)

alt text

ofmrew

@mrjj Thanks. I am just use to using the mouse to select and then copy. Using the List versus the Vector will not be a problem, but my question is why is QVector different and why does QList not have the same restrictions?

mrjj

@ofmrew
hi
VRonin explains here
https://forum.qt.io/topic/84222/qdatastream-serialze-deserialize-myclass-pointer/7

ofmrew

@mrjj Thanks. I think I understand the problem.

mrjj

@ofmrew
Super
in case you want extra info
http://en.cppreference.com/w/cpp/concept/DefaultConstructible