CPP中，数字后跟单引号，又跟3个0，怎么编译通过

比如：

unsigned long nodeDataCacheSize = 5'000; unsigned long wayDataCacheSize =40'000; unsigned long areaDataCacheSize = 5'000; unsigned long routeDataCacheSize= 1'500;

实际上是千分位。

编译

-std=c++14