C++ 文字列変換

sample.cpp

// 文字列変換
// 拡張子を変換 ... を想定
std::string replaceExtension(std::string fileName,
                             const std::string fromExt,
                             const std::string toExt)
{
    //Ex.
    //std::string fileName      = "samplefile.plist";  //-> "samplefile.pvr.ccz";
    //const std::string fromExt = ".plist";
    //const std::string toExt   = ".pvr.ccz";

    //最後尾を検索
    const std::string ::size_type pos = fileName.find_last_of(fromExt);
    if (pos != std::string::npos)
    {
        //変換開始位置
        const auto index = (pos + 1) - fromExt.size();

        //文字列変換
        fileName.replace(index, fromExt.size(), toExt);
    }

    return fileName;
}

...あまり意味ないかもですが...
Cocos2d-x テクスチャファイルの解放で使えるかな...と思って... ^^;

std::string fileName = "xxx.plist";
std::string imageName = replaceExtension(fileName, ".plist", ".pvr.ccz");

SpriteFrameCache::getInstance()->removeSpriteFramesFromFile(fileName);
Director::getInstance()->getTextureCache()->removeTextureForKey(imageName);