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Small reading utility.

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Bert Peters
2019-12-03 18:43:13 +01:00
parent 3dca1a46e1
commit b31d56c4ac
2 changed files with 7 additions and 1 deletions
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2
2019/src/day03.cpp
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@@ -27,7 +27,7 @@ namespace {
for (auto entry = aoc2019::strtok(line); !line.empty() || !entry.empty(); entry = aoc2019::strtok(line)) { for (auto entry = aoc2019::strtok(line); !line.empty() || !entry.empty(); entry = aoc2019::strtok(line)) {
const auto dir = DIRECTION_MAP.at(entry[0]); const auto dir = DIRECTION_MAP.at(entry[0]);
std::size_t amount = 0; std::size_t amount = 0;
std::from_chars(entry.data() + 1, entry.data() + entry.size(), amount); aoc2019::from_chars(entry.substr(1), amount);
assert(amount > 0 && "Must have some valid direction"); assert(amount > 0 && "Must have some valid direction");
for (std::size_t i = 0; i < amount; ++i) { for (std::size_t i = 0; i < amount; ++i) {

6
2019/src/utils.hpp
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@@ -1,10 +1,16 @@
#pragma once #pragma once
#include <charconv>
#include <functional> #include <functional>
#include <string_view> #include <string_view>
namespace aoc2019 { namespace aoc2019 {
template<typename T>
inline std::from_chars_result from_chars(std::string_view str, T& value) {
return std::from_chars(str.data(), str.data() + str.size(), value);
}
template<typename T> template<typename T>
void combine_hash(std::size_t& seed, const T& o) { void combine_hash(std::size_t& seed, const T& o) {
// Algorithm taken from boost::combine_hash. // Algorithm taken from boost::combine_hash.