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            Replaces each element of a given sequence for which an unary function
            object evaluates to true
            replaced with a new value.
          
template<
    typename Sequence,
    typename F,
    typename T>
typename result_of::replace_if<Sequence const, F, T>::type replace_if(
    Sequence const& seq, F f, T const& new_value);
Table 1.71. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Operation's argument | 
| 
                       | 
                      A function object for which  | Operation's argument | 
| 
                       | Any type | Replacement value | 
replace_if(seq, f, new_value);
Return type: A model of Forward Sequence.
            Semantics: Returns a new sequence with
            all the elements of seq,
            with new_value assigned
            to each element for which f
            evaluates to true.
          
Constant. Returns a view which is lazily evaluated.
#include <boost/fusion/algorithm/transformation/replace_if.hpp> #include <boost/fusion/include/replace_if.hpp>
struct odd { template<typename T> bool operator()(T t) const { return t % 2; } }; ... assert(replace_if(make_vector(1,2), odd(), 3) ==make_vector(3,2));