libtcod - C++: How To Use %i in Function? -

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i have little question, possible use %i in function? here need do. have function callback:

engine.gui->menu.additem(menu::agility,"agility (+1 defense)");

and want use in way:

engine.gui->menu.additem(menu::agility,"agility (%i defense)",engine.level);

how need implement that, or might not possible? tried best something, didn't managed it. :( reason want player avenges next level, engine.level counts gets ++, player level ups can more agility in different levels, , leveling can informed how many agility get.

most boost::format (http://www.boost.org/doc/libs/1_54_0/libs/format/) should want. won't exact syntax should close.


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