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186 lines (180 loc) · 6.11 KB
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// Copyright (c) Darrell Wright
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/beached/header_libraries
//
#include "daw/daw_function_table.h"
#include <cstdint>
#include <iostream>
#include <type_traits>
using parser_func_t = std::add_pointer_t<uintmax_t( uintmax_t, char const * )>;
constexpr uintmax_t ret( uintmax_t n, char const * ) {
return n;
}
inline constexpr daw::function_table_t<uintmax_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t,
parser_func_t>
ftable{ ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
ret,
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 0;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 1;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 2;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 3;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 4;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 5;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 6;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 7;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 8;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
},
+[]( uintmax_t n, char const *c ) {
n = n * 10U + 9;
++c;
return ftable( static_cast<size_t>( *c ), n, c );
} };
int main( int argc, char **argv ) {
char const *ptr = "12345678";
if( argc > 1 ) {
ptr = argv[1];
}
uintmax_t result = ftable( static_cast<size_t>( *ptr ), 0U, ptr );
std::cout << result << '\n';
}