Template template example

tt.cpp

template<template<typename, typename> typename T1, typename T2>
class Foo
{
    T1<int, float> t1a;
    T1<int, int> t1b;
    T2 t2;
};

template<typename T1, typename  T2>
struct Bar
{
    T1 t1;
    T2 t2;
};

template<typename T1, typename  T2>
struct Baz
{
    T1 t1a;
    T1 t1b;
    T2 t2;
};


int main()
{
    Foo<Bar, float> foo1{};
    Foo<Baz, float> foo2{};
}