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matrix_traits<Matrix>::cols

static int const cols = /*user-defined*/;

This member of user-defined (partial) specializations of the matrix_traits template must be a compile-time integer constant greater than zero that defines the number of columns of a user-defined matrix type.

See also: assign(matrix,matrix) | deduce_matrix | determinant | inverse | make(matrix) | matrix_traits | operator!=(matrix,matrix) | operator*(matrix,matrix) | operator*(matrix,vector) | operator*(vector,matrix) | operator*=(matrix,matrix) | operator+(matrix,matrix) | operator+=(matrix,matrix) | operator-(matrix,matrix) | operator-=(matrix,matrix) | operator==(matrix,matrix) | SFINAE