CODEWITHSUNDEEP
c++c++11boost
user2030677
user2030677

Reputation: 3526

Expected type specifier

I am getting this error when I use boost/random/uniform_int_distribution.hpp and do:

boost::random::uniform_int_distribution<> dist(0, 5);

The error I get is:

$ g++ game.cpp -std=c++11 -Wall -Ipath/to/boost -o game && ./game

game.cpp:11:20: error: expected type-specifier
game.cpp:11:20: error: expected '>'

Why am I getting this error?

Note: I don't get this error when I use std::uniform_int_distribution<>.

This is the code causing the problem:

#include <boost/random/uniform_int_distribution.hpp>

template<
    class Engine = boost::default_random_engine
>
class game
{
    boost::random::uniform_int_distribution<int> dist{0, 5};
};

int main()
{
}

Upvotes: 2

Views: 1060

Answers (1)

Praetorian
Praetorian

Reputation: 109109

Boost.Random doesn't define a default_random_engine type. Use the Mersenne twister engine directly instead (or one of the other generators it defines)

#include <boost/random/uniform_int_distribution.hpp>
#include <boost/random/mersenne_twister.hpp>

template<
    class Engine = boost::mt19937
>
class game
{
    boost::random::uniform_int_distribution<> dist{0, 5};
};

Also, since the question is tagged C++11, I'll mention that the standard library does define both std::default_random_engine and std::uniform_int_distribution in the <random> header.

Upvotes: 5

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