serge-sans-paille
0c588214e4
Differential Revision: https://phabricator.services.mozilla.com/D289446
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsFmtCString_h_
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#define nsFmtCString_h_
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#include "fmt/format.h"
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#include "fmt/xchar.h"
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#include "nsString.h"
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/**
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* nsTFmtString lets you create a nsTString using a C++20-style format
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* string. For example:
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*
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* NS_WARNING(nsFmtCString("Unexpected value: {}", 13.917).get());
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* NS_WARNING(nsFmtString(u"Unexpected value: {}", u"weird").get());
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*
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* nsTFmtString has a small built-in auto-buffer. For larger strings, it
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* will allocate on the heap.
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*
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* See also nsTSubstring::AppendFmt().
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*
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* Note also that for one-off C strings you can also use fmt::format() directly:
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*
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* NS_WARNING(std::format("Unexpected value: {}", 13.917).c_str());
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*
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*/
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template <typename T>
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class nsTFmtString : public nsTAutoStringN<T, 16> {
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public:
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template <typename... Args>
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explicit nsTFmtString(
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fmt::basic_format_string<T, std::type_identity_t<Args>...> aFormatStr,
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Args&&... aArgs) {
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this->AppendFmt(aFormatStr, std::forward<Args>(aArgs)...);
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}
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};
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template <typename Char>
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struct fmt::formatter<nsTFmtString<Char>, Char>
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: fmt::formatter<nsTString<Char>, Char> {};
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#endif // !defined(nsFmtString_h___)
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