christoph/cpp-masssprings
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squash merge efficient-puzzle into main

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Christoph Urlacher
2026-03-02 05:26:57 +01:00
parent 846ff72d1f
commit 2ef2a29601
16 changed files with 1915 additions and 859 deletions
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88
include/util.hpp
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@ -3,20 +3,66 @@
#include <iostream>
#include <raylib.h>
#include <raymath.h>
inline auto operator<<(std::ostream& os, const Vector2& v) -> std::ostream&
// Bit shifting + masking
template <class T>
requires std::unsigned_integral<T>
auto create_mask(const uint8_t first, const uint8_t last) -> T
{
os << "(" << v.x << ", " << v.y << ")";
return os;
// If the mask width is equal the type width return all 1s instead of shifting
// as shifting by type-width is undefined behavior.
if (static_cast<size_t>(last - first + 1) >= sizeof(T) * 8) {
return ~T{0};
}
// Example: first=4, last=7, 7-4+1=4
// 1 << 4 = 0b00010000
// 32 - 1 = 0b00001111
// 31 << 4 = 0b11110000
// Subtracting 1 generates a consecutive mask.
return ((T{1} << (last - first + 1)) - 1) << first;
}
inline auto operator<<(std::ostream& os, const Vector3& v) -> std::ostream&
template <class T>
requires std::unsigned_integral<T>
auto clear_bits(T& bits, const uint8_t first, const uint8_t last) -> void
{
os << "(" << v.x << ", " << v.y << ", " << v.z << ")";
return os;
const T mask = create_mask<T>(first, last);
bits = bits & ~mask;
}
template <class T, class U>
requires std::unsigned_integral<T> && std::unsigned_integral<U>
auto set_bits(T& bits, const uint8_t first, const uint8_t last, const U value) -> void
{
const T mask = create_mask<T>(first, last);
// Example: first=4, last=6, value=0b1110, bits = 0b 01111110
// mask = 0b 01110000
// bits & ~mask = 0b 00001110
// value << 4 = 0b 11100000
// (value << 4) & mask = 0b 01100000
// (bits & ~mask) | (value << 4) & mask = 0b 01101110
// Insert position: ^^^
// First clear the bits, then | with the value positioned at the insertion point.
// The value may be larger than [first, last], extra bits are ignored.
bits = (bits & ~mask) | ((static_cast<T>(value) << first) & mask);
}
template <class T>
requires std::unsigned_integral<T>
auto get_bits(const T bits, const uint8_t first, const uint8_t last) -> T
{
const T mask = create_mask<T>(first, last);
// We can >> without sign extension because T is unsigned_integral
return (bits & mask) >> first;
}
// std::variant visitor
// https://en.cppreference.com/w/cpp/utility/variant/visit
template <class... Ts>
struct overloads : Ts...
@ -24,6 +70,8 @@ struct overloads : Ts...
using Ts::operator()...;
};
// Enums
enum direction
{
nor = 1 << 0,
@ -67,6 +115,20 @@ enum bg
bg_white = 47
};
// Output
inline auto operator<<(std::ostream& os, const Vector2& v) -> std::ostream&
{
os << "(" << v.x << ", " << v.y << ")";
return os;
}
inline auto operator<<(std::ostream& os, const Vector3& v) -> std::ostream&
{
os << "(" << v.x << ", " << v.y << ", " << v.z << ")";
return os;
}
inline auto ansi_bold_fg(const fg color) -> std::string
{
return std::format("\033[1;{}m", static_cast<int>(color));
@ -81,22 +143,22 @@ inline auto ansi_reset() -> std::string
template <typename... Args>
auto infoln(std::format_string<Args...> fmt, Args&&... args) -> void
{
std::cout << std::format("[{}INFO{}]: ", ansi_bold_fg(fg_blue), ansi_reset())
<< std::format(fmt, std::forward<Args>(args)...) << std::endl;
std::cout << std::format("[{}INFO{}]: ", ansi_bold_fg(fg_blue), ansi_reset()) << std::format(
fmt, std::forward<Args>(args)...) << std::endl;
}
template <typename... Args>
auto warnln(std::format_string<Args...> fmt, Args&&... args) -> void
{
std::cout << std::format("[{}WARNING{}]: ", ansi_bold_fg(fg_yellow), ansi_reset())
<< std::format(fmt, std::forward<Args>(args)...) << std::endl;
std::cout << std::format("[{}WARNING{}]: ", ansi_bold_fg(fg_yellow), ansi_reset()) << std::format(
fmt, std::forward<Args>(args)...) << std::endl;
}
template <typename... Args>
auto errln(std::format_string<Args...> fmt, Args&&... args) -> void
{
std::cout << std::format("[{}ERROR{}]: ", ansi_bold_fg(fg_red), ansi_reset())
<< std::format(fmt, std::forward<Args>(args)...) << std::endl;
std::cout << std::format("[{}ERROR{}]: ", ansi_bold_fg(fg_red), ansi_reset()) << std::format(
fmt, std::forward<Args>(args)...) << std::endl;
}
#endif