C++ exception specifications are known [1] to cause more trouble than they are worth and have been deprecated [2] in C++11 and only the noexcept specifier remains, which has a much smaller scope.

[1] http://www.gotw.ca/publications/mill22.htm
[2] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3051.html

Additionally to the problems they cause they also result in plenty of warnings by static code analyzers, which distracts from real problems.