Update readme for f_to_string

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Clyne 4 years ago committed by GitHub
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@ -6,10 +6,11 @@
* Supports converting to any base between 2 and 36 inclusive * Supports converting to any base between 2 and 36 inclusive
* No external dependencies, only includes `type_traits` for template parameter checking * No external dependencies, only includes `type_traits` for template parameter checking
* Supports custom character types, e.g. `to_string<123, 10, wchar_t>` * Supports custom character types, e.g. `to_string<123, 10, wchar_t>`
* C++20: Supports floating-point-to-string conversion with `f_to_string`
**How to use:** **How to use:**
This single header file provides a `to_string` utility, which may be used as below: The file `to_string.hpp` provides a `to_string` utility, which may be used as below:
```cpp ```cpp
const char *number = to_string<2147483648999954564, 16>; // produces "1DCD65003B9A1884" const char *number = to_string<2147483648999954564, 16>; // produces "1DCD65003B9A1884"
@ -22,6 +23,13 @@ With `to_string`, all that will be found in program disassembly are the resultin
Try it [on Compiler Explorer](https://godbolt.org/z/T-MFoh). Try it [on Compiler Explorer](https://godbolt.org/z/T-MFoh).
`f_to_string.hpp`, requiring C++20, provides an `f_to_string` utility for floating-point conversion:
```
puts(f_to_string<3.1415926>); // Defaults to 5-point precision: "3.14159"
puts(f_to_string<{3.1415926, 7}>); // Specify precision: "3.1415926"
```
# How it works # How it works
The basic structure of `to_string` is shown below: The basic structure of `to_string` is shown below:
@ -29,7 +37,7 @@ The basic structure of `to_string` is shown below:
```cpp ```cpp
template<auto N, unsigned int base, typename char_type, /* N type-check and base bounds-check */> template<auto N, unsigned int base, typename char_type, /* N type-check and base bounds-check */>
struct to_string_t { struct to_string_t {
char_type buf[]; // Size selection explained later. char_type buf[]; // Array size determination explained later.
constexpr to_string_t() {} // Converts the integer to a string stored in buf. constexpr to_string_t() {} // Converts the integer to a string stored in buf.
constexpr operator char_type *() {} // These allow for the object to be implicitly converted constexpr operator char_type *() {} // These allow for the object to be implicitly converted
constexpr operator const char_type *() {} // to a character pointer. constexpr operator const char_type *() {} // to a character pointer.

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