以前のリビジョンの文書です
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====== 配列 ====== ---- ===== 動的メモリ確保・解放 ===== === 1次元配列 === <code cpp> ////////// 確保 ////////// double *array1; int n1 = 10; array1 = new double[n1]; ////////// 解放 ////////// delete[] array1; </code> ---- === 2次元配列 === == 方法１ == * 一度に確保できるのは1次元までなので、1次元ずつ確保していく。 * 解放も同様に1次元ずつ。 * 配列ポインタへの配列、という扱いで、最初の足ごとに配列の要素数を変えることも可能 <code cpp> ////////// 確保 ////////// double **array2; int n1 = 10; int n2 = 20; array2 = new double*[n1]; for(int i = 0 ; i < n1 ; ++i){ array2[i] = new double[n2]; } ////////// 解放 ////////// for(int i = 0 ; i < n1 ; ++i){ delete[] array2[i]; } delete[] array2; </code> == 方法2 == 後ろの足のサイズが先に決まっている場合、最初の足だけ動的に確保してやるやり方もできる。 <code cpp> ////////// 確保 ////////// double (*array2)[20]; int n1 = 10; array2 = new double[n1][20]; ////////// 解放 ////////// delete[] array2; </code> == 方法3 == std::vectorでやっちゃう <code cpp> int n1 = 10; int n2 = 20; std::vector< std::vector<double> > array2( n1, std::vector<double>(n2) ); </code> ---- === 3次元配列 === 2次元と同様。 <code cpp> ////////// 確保 ////////// double ***array3; int n1 = 10; int n2 = 20; int n3 = 20; array3 = new double**[n1]; for(int i = 0 ; i < n1 ; ++i){ array3[i] = new double*[n2]; for(int j = 0 ; j < n2 ; ++j){ array3[i][j] = new double[n3]; } } ////////// 解放 ////////// for(int i = 0 ; i < n1 ; ++i){ for(int j = 0 ; j < n2 ; ++j){ delete[] array3[i][j]; } delete[] array3[i]; } delete[] array3; </code> ----
